I was a corporate worker in my 30’s, when I woke up and found that I had time leaped to the spring of my second year of high school. At the time, there was a teacher that I had regretted not confessing to, so I confessed to her in the heat of the moment, and now we’re dating! However, the teacher is one who would make any man a good for nothing person, so I end up being spoiled by her a lot.
While secretly dating my overworked teacher (lover), a sweet school life filled with flirting awaits. A 2nd year high schooler with a 30 year old me on the inside and the teacher (lover) that I want to pamper, our everyday romantic comedy begins.

From JShoujo Scans

I Can Hear the Ghostly Drum-Beating
The first guy Rika ever falls for turns out to be her older sister's fiancé. However, her sister's dream since she was a child was to be a bride, and ever since her engagement to another guy didn't work out a few years earlier due to her not being able to conceive, Rika swore to do everything in her power to help her sister fulfill her dream. Does that include helping her marry the guy that she's in love with?!

Like Snow Falling on Harbor
Yori runs into Kurita, a girl he knew from basketball club back in high school. Back then, she was a quiet girl who had a quirky oddness to her. When he runs into her out of coincidence two years later, however, he finds that she's become an out-going (if not slightly high-strung) girl. A few weeks after their chance meeting, he receives a phone call from the hospital saying she had tried to kill herself, and he finds out the true reason for the drastic change.

Fight!
Yuki's a hard-working 21 year old who's tirelessly slugging away as a coordinator at a English language school so that she can save enough money to go study abroad. She has no interest in guys because she's so set on her goal---that is, until she meets Yuki, a guy with the same name as her. They move in together only days after they met, and at first things go well, but one day, he hits her in the face by accident. The violence escalates as the days wear on --- will their love last?!

The Days of the Sun
Nana and Ichi are twins who are as close as can be. Sure the people around them think it's odd that they still sleep in the same bed --- but they couldn't care less what others think. All they need is each other. One day, they run into a scruffy looking man wearing dark sunglasses who claims that he's their long-lost dad! Is it really him? And why did he choose to reveal himself to them now?

Includes other stories which all center around the theme: "a rose-colored tomorrow."

From DrCoke at MangaHelpers:
Boy meets girl, but in this case, the girl is part of a family specializing in fighting evil spirits. Kamishiro Renge battles evil spirits with the help of her assistant cat Tama. The boy is... just a boy. Yuta fell in love with Renge the moment he met her, but will he be able to keep up with her profession? Will she be able to lead a normal life with Yuta?

Newlyweds Ruiji and Haru are head over heels for each other, but their relationship is completely flipped!
The husband, Ruiji, is the kind, family-oriented homemaker, and his wife, Haru, is a hard-working elite bank clerk.
Would you like to take a peek at their sweetness filled lives?

Takayama, a teacher living his teacher's life "going on with the flow", is being scolded for his lazy attitude by Fuyuno, the most talented female student in his grade. In fact, Fuyuno has special feelings for Takayama...? Can the forbidden love between a teacher and a female student be avoided?

Present day, present time. For some reason, rare newborns get swapped with the newborns from another world. They have the features of legendary creatures (like dwarves, oni, harpies etc), however, they lack the abilities of their legendary predecessors. Our heroine, an elf girl Kazamori suffered through her childhood because other kids expected her to wield magic like a true elf. She tries to uphold her "magic user" image in high school but the person who finds out her secret is an ordinary human who practices magic-like science.

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world, exist huge humanoid weapon known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid and Adeltrud Olter: together they will aim to become Knight Runner, pilot of Silhoutte Knight.

Hasegawa Kodaka has transferred schools, and he's having a hard time making friends. It doesn't help that his blond hair tends to make people think he's a delinquent. One day, he runs into his bad-tempered solitary classmate Yozora while she's talking animatedly to her imaginary friend Tomo. Realizing that neither of them have any actual friends, they decide that the best way to alter this situation is to form a club and start recruiting.

That is how "Rinjinbu" was formed, a club specifically designed for people who don't have very many friends. As other lonely classmates slowly join their little club, they'll try to learn how to build friendships through cooking together, playing games, and other group activities. But will this group of relationship-challenged misfits really be able to get along?

Age 41, Oh Joong Seok. A man who did all kinds of misdeeds and put his life on the line for the organisation to gain the highest position. But who knew the end of his life would be so miserable… Joong Seok’s ‘virtuous living’ project starts now, one by one.

Miko leaves the house of her parents to live with her uncle who runs a boarding house, but her first meeting with Matsunaga-san isn't good and then he discovers that she is one of her uncle's tenants. Even as a secondary student she surrounds herself with university students who have a very different life from her own. Can she fit into her new home?

When I regained consciousness, I found myself in an otome game. I would quickly head towards destruction. It made no difference whether it was a good ending or a bad ending. I became the character known as, “Mariabell Tempest,” the daughter of a pedigree family. Despite possessing an unrivaled level of beauty, I had the worst personality, that of a villainess.

Nevertheless, I was conscious, but was unable to make any actions as I was completely in auto-mode. In the first playthrough, I was extremely flustered; on the second playthrough, I was despairing; by the third round, I had already given up. And now, the fifth round has already ended. For the sixth round, for some reason I had become a young girl and regained the ability to move and talk. Eh, what the heck is this?

Lizardmen are hit by disasters today in a high school, where there are various races such as elves and beasts. But this lizard is quite delicious, and I'm sick of it!

When a certain man is released from prison, he knows exactly where he's heading first. After falling in love with a traditional comic storyteller's rendition of the story called "Shinigami," he is determined to become his apprentice. The performer, Yakumo, has never taken an apprentice before, but to everyone's surprise, he accepts the eager ex-prisoner, nicknaming him "Yotaro."
As Yotaro happily begins his new life, he meets others in Yakumo's life, including Yakumo's ward Konatsu. Konatsu was the daughter of a famous storyteller, and Yakumo took her in after her father's tragic death. Konatsu loved her father's storytelling, and would love to become a performer in her own right--but that path is not available for women.

Note: Won the 38th Kodansha Manga Awards for Best General Manga and the New Creator Tezuka Osamu Cultural Prize in 2017.

Receptioning the newcomers is a task for YuYang, and he ends up helping the unsociable and towering LiHuan, the kind of person that does everything to be disliked. But after better knowing each other, he discovers that the giant isn't that bad of a person at all ...

This manga based on the ever popular AKB48 group.

Yoshinaga Hiroko loves AKB48. Urayama loves her, but doesn't think much of AKB48.

Urayama Minoru has a pretty face even compared to girls. After his friends planted the idea that Hiroko was going on a date, he follows Hiroko to an AKB48 concert. There, Minoru finds himself backstage with a pass he found on the ground and then in several lucky pervert situations with many of the AKB star members. After being chased and accused a pervert, his impression of them only worsens. But when he gets to the audience seats and the concert starts, he was dumbfounded: Were they really the same girls he met before? Hiroko spots Minoru. He learns she was not on a date, just in love with the group. There, Hiroko confides in him she's always wanted to shine bright on a stage like them. Although she is not confident in herself, yet can't help but wanting to try. She resolves that her next audition will be her final one and then she'll give up.

Then Minoru decides he will help her in the audition any way he can, even if it means he has to participate too...as a girl.

As Urakawa Minori, he helps Hiroko pass the audition, but inadvertently passes as well. Thus, Hiroko and Minoru's road as idols of AKB48 begins...

I love long hair! Tatsu Yunoki, our MC, who deeply loves the beautiful long female hair, heard a voice scream his name, it was Kotoka Hatsushima, and under the impulse of alcohol, both he and she, decided to date together. All they know is that they love each other's hair and back?! It’s not necessary to know anything else! They clash fetish against fetish, and come together in a fun and romantic comedy! And well... What is your fetish...?

A high school student, Akito who hates people around him, accidentally took a picture of a passing by young girl during his daily routine of taking scenery pictures. Then, He realized it was the girl who recently transferred to his school. He planned to talked about the accident of him taking the image but... somehow the girl he took looks different?

"If you wrote me, then you can give me the throne!"

Yoonsoo is the successful author of a popular fantasy series. Just as she's about to start work on a new series, Imperial Prince Kyte Einzen, the worst villain she created has kidnapped her into the world of her own story?! Can she mold this nightmare into a story that will turn both their fates around? Based on the hit novel.

Chu Qing is a sword expert cultivator, who 300 years ago accidentally entered the fairy world. During those 300 he began his cultivation journey. At the time of reaching the realm of eternity, it was not expected that he would instead open the hall of time and space and return to earth at the age of 17 years. But when he saw the situation, it turns out it was not the earth he once lived in, but the world was reversed between the roles of women and men. How was his journey to find a way to return to the original world, and defeat and conquer the strong women in the world ...

In one particular town in France, a waiter who feels like he’s stuck at the bottom of the sea meets a free-spirited pâtissier. Across the world, on a frozen tundra, a boy searching for his father meets a scientist and a man with the look of a snowy owl.