From cotton candy scans:

~Volume One~
Behind the school building, at the pool, on the stairs outdoors... Somewhere in these nooks and crannies on campus, someone is experiencing the love of their lifetime.

❤︎ Hajimete no Kiss/My First Kiss:
While helping Tatsumi-senpai hide from his fans, Ena, who usually eats by herself, takes this opportunity to have secret lunches together with him?!

❤︎ Kimimachi Candy/Candy While Waiting for You:
Rina, a member of the school's concert band, always waits for the track-and-field team's Nishimiya on the stairs' landing. She really wanted to confess to him today, but...

Various pairings experience "the happiest event that occurs in one's life" in this gem of an omnibus about youth! Four oneshots included in this volume.

~Volume Two~
A childhood friend, a kouhai from club activities, an admired senpai... This highly-acclaimed omnibus gathers precious moments between "you and that special person" in a brand-new second volume!

❤︎ Sotsugyou Sugar/Graduation Sugar:
After graduating from high school, her childhood friend Iku is going to Tokyo. Misato wants to finally confess to him today, but...

❤︎ Hajimete wa, Kimi to/My First Time, With You:
It's spring. Right after the opening ceremony, she finds a folding umbrella and a note on her desk. Surprisingly, the sender turns out to be the "grandson of someone who borrowed the umbrella a long time ago" and also the guy Rin is interested in...?!

This gem of a second volume includes four more oneshots!

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."

A dramatization of the real life of Yaeko Yamamoto. Over 100 years ago, Yaeko broke traditional Japanese stereotypes, gender, and honor to become a gun-warrior in defense of her homeland of Aizu.

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?

I have no friends and no girlfriend, and my family is very poor. But one day I get an electric shock, and I turn into a handsome doctor from the game! And it seems that I have incredible abilities! Soon my life will change!

Manaka Sakiko is a huge fan of Chihiro, an idol from the idol group Haruiro Sunshine, and on her first day of high school she finds out the new girl sitting next to her is none other than Chihiro herself. No one else recognises Chihiro, so Sakiko resolves to keep her knowledge under wraps, but when she accidentally slips and reveals she's a fan, she unwittingly makes herself the enemy of another Chihiro devotee, one who isn't keen on sharing.

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.

The hostess Lingyue was murdered by her best friend and her husband... In order to hide the crime, she was thrown into the wilderness. There, she was possessed by spirits and filled with hatred, she started on her path to avenge her death...

A couple of decades have passed since Ultraman last was seen in Tokyo, and his kaiju nemeses seem to have gone back into outer space. Former Ultraman Shin Hayata has forgotten that he ever wore the metal suit, though as Minister of Defense he still takes a keen interest in protecting Japan. His young son Shinjiro knows that his dad once worked with the SSSP (Science Special Search Party), but not that that explains how he came to have amazing strength and other seemingly supernatural abilities; as a moody teen he just thinks they make him weird. But then one day a dangerous alien comes back to Earth, and everything starts to become clear. Will Shinjiro don the suit and become the new Ultraman?

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.

Bonus stories following the convicts featured in Baki's death row inmates arc after the events of Baki's second manga. Released in the "Baki" series' 2018 shinsouban as mutual promotion with the anime.

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?

Chrome was a magician in the hero’s party.

He fought the Demon Lord’s army alongside people like Irina, the lover who vowed to marry him in the future, and the hero, Yuno, who was his close friend.

They were all close companions. However, that was only in Chrome’s mind.

His lover, Irina, became intimate with the hero, Yuno, and Chrome was sacrificed to make the hero stronger. Chrome’s magic powers were snatched away and he was kicked out of the party. Demons surrounded him as he was on the verge of death and he was driven to a corner.

At that moment, Chrome awakened to a “darkness” within himself.

Amidst his despair, he acquired an unrivaled skill.

Now with this skill, he could exact revenge.

Vampires have been defeated by Humans. A story about them wearing collars. Wait - you're mistaken, it's not like that!

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?