Tomoki, a young man with a thing for ecchi stuff, is used to living alone, with his dad traveling all the time. However, he is not prepared for the sudden arrival of his 9-year-old twin sisters, whom he never knew even existed! Toujou Minaho, the big-breasted girl next door, is ready to help out, but these cute little girls are quite a handful.... From Baka-Updates: Kamishiro Tomoki is an Otaku who is studying for college. One day, he received an outrageous "package" from his father: 9 year old blond girls who are his dad's illegitimate children from one of his business trips...... The twins, Selly and Riru are completely spoiled and drives Tomoki crazy. Not only that, the sisters have a "secret" plan to kick out Tomoki and claim the house just for themselves. Will Tomoki manage to make peace with the girls? Read and find out!

Tough, lazy, money lover, yet beautiful high school student named Shin Bia. While she's thinking about the eras she suddenly falls into that ancient time period! She had to transform into an elegant lady and while she's there she faces quite an obstacle.

Yuuki Ashikaga is a high-school freshman at Sakakino Academy. While working as a student librarian, he grows enamored of Kotonoha Katsura, a girl who frequents the library. Unfortunately, Kotonoha is already dating Makoto Itou, another schoolmate.

The situation is further complicated when Chie, Yuuki's older sister introduces him to Roka Kitsuregawa, her kouhai in the basketball club. Roka becomes interested in Yuuki, who only has eyes for Kotonoha. In order to make him jealous, Roka lies and claims she already has a boyfriend, her former classmate Makoto Itou. Unfortunately for all of them, Roka's lie sets off a chain of events no one could have predicted...

Note: Cross Days takes place in the middle of the original School Days storyline and provides an alternate take on how things might have turned out.

Tsuchie Takeshi has dreams of when he played with Hikari-chan as a child. He remembers her as a kind, sweet girl. However, one day on the way home from school, Takeshi is abducted and taken to a huge house, only to find out that she's become an arrogant, violent dominatrix (emphasis on violent). Furthermore, she says that he promised to marry her! How will he adjust to her new personality, and living with her as a new son of her prestigious family?

To cure his persistent virginity, Yuuto Mutsura joins his friend Naota in a trip to Aqua Eden, the "City-by-the-Sea", where brothels are allowed. Before he has a chance to become man, he is separated from his friend and accidentally turned into a vampire! Now forbidden to leave the city and forced to participate in a Public Morals task force with several beauties, how will Yuuto handle this new life?

Onizaki Teppei is a high-school freshman who just wants to live a plain student life, but his world is rudely shaken by a mysterious girl, Mitogawa Enma, who declares her intent to find a husband at the school!

From ryColaa:
Our hero, who doesn't know how to swim, joins his school swimming club and begins to learn from their star swimmer who loves swimming more than anything. Good thing she's cute and nice to boot!

Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. This is a series of characters' introductions to prelude the main story.

Kohei Hasekura is a sophomore who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. But under the peaceful surface, this prestigious academy holds a dark secret. Some of its students are vampires! And Kouhei will be dragged deeper and deeper into the mystery of the school and the girls that attend.

From Tokyopop:
Aliens have landed on Earth and are now a normal part of society. These beautiful beings have been given the name "DearS" and are trusted and welcomed by most humans. In order for the "DearS" to learn Earth's customs, they are sent to random high schools to "home-stay." When Takeya helps a DearS in his school, she calls him "Master." Thus begins the humorous life of Takeya and his sexy alien follower, Ren, who tries to figure out the wacky customs of this place called Earth!

From Wingtip Cafe:

Udagawa Kachiko is a studious no-nonsense high-school girl. One day, she found an entrance to a fantastic world called Fusuma Land.

From Viz:
Miaka Yuuki is an ordinary junior-high student who is suddenly whisked away into the world of a book, "The Universe of th Four Gods". There she becomes the priestess of the god Suzaku, and is charged with finding all seven of her Celestial-Warrior protectors.

While testing his 8 mm camera at night in his small town, Kaito Kirishima is caught in a mysterious explosion. Strangely, Kaito wakes up the next day perfectly fine, but with no recollection of what exactly happened the day before. Unfazed by what seems to have been just a dream, he heads to school not giving much thought to the incident. Discussing his camera with his friends, they decide to make a movie during summer break. They invite two upperclassmen to participate in the project: the recently arrived Ichika Takatsuki and the odd Remon Yamano. In a strange twist of fate, Ichika starts living with Kaito because his sister has to work overseas. Summer days are about to get exciting for the small film crew.

Our heroine, Ruu, is having a hard time. Her mother died when she was little, and her father, with whom she had been living, has disappeared without a trace after getting into debt. Ruu is on her own.
To make ends meet, she takes a job as a live-in maid for a very wealthy household. To Ruu's surprise, the house she ends up working at is the home of three cute brothers, and she already knows one of them! They agree to let Ruu work there because they are often alone and they could use the help. Ruu moves in and works hard as a maid, and they all become very close. But things aren't always smooth sailing. Ruu has a lot of pressure on her because of her father's debts, and three very cute guys to deal with!

From Da Gurlz Translationz:

Because Yukino's mom is a housekeeper for the Renjo familiy, she has to suffer the pain of hearing her mom praise the family she takes care of. And this is why Yukino has been trying to beat Renjo Tamaki for most of her life, so her mom would care more about her than the Renjo family. But when her mom gets sick, and she has to take care of the Renjo family instead, her goals change a little.

Also contains the side story "Kira Kira Suruhimade" in the final volume.

Goto Nagi has travelled to the southern island of Okitsushima, and ventures out to see Umi no Misaki, a striking cape jutting out into the ocean. But when he arrives, he finds that there is much more to this cape than a wondrous view. There is something peculiar about the cape, and about the island's inhabitants.

From tethysdust at MangaHelpers:

Minaguchi Kaoru is nothing special. He's no good at sports or school, isn't in any clubs, and he's not popular. He has no friends and isn't even interested in any of the girls he knows. He's also teased due to the fact that he loves shoujo manga. Unlike the harem daydreams of his peers, he dreams of finding his true love. Unfortunately, a shinigami comes to kill him, simply because he's a "forever alone" sort of guy. When he gasps out his intention of embracing life with his final breaths, though, she takes it back! As long as he follows through on his intentions, he won't be killed.

To convince the shinigami that his plans are genuine, he declares that he will confess to the girl he likes, the very next day. Expecting failure with confessing to random girls in his school, he sends out love letters to four different girls. To his surprise, they all agree to be his girlfriend. Now, this shoujo-manga-loving guy has ended up in a kind of harem story, quadruple-timing four girls! Will he be able to stay involved enough with society to avoid an early death?

There is fighting going on at a high school due to a power struggle for control. A beautiful young girl, the granddaughter of the director, requests help from a tough silly young man renowned for his genius fighting style. At the same time, other beautiful girls appear from the same high school who also want him as a teacher. Will he help and if so, which side will he choose to support? Or will he just show his true face with his bad boy ways?

From Chibi Manga:

The most popular group of idols.
Hina loves the leader of the group, Chiaki. After their representation, she was so excited that she came to see Chiaki. And they kissed!! Then, they started going out together. But Chiaki designated her as his "pet". Hina is so happy but will she support being only a "pet"...?!