Masato kyobashi suffering from a illness which does not allow him to do any strenous activity becomes the manager of the school's swimming club.
It is a manga about his everyday life in the swimming club surrounded by beautiful girls.

Abe Takahiro is an ordinary, well-adjusted, high school student, who falls in love with his bespectacled classmate Asai Rumi, thinking she's just a cute member of the art club. Alas, his love is anything but ordinary - she's actually a hardcore yaoi-loving fujoshi who is utterly convinced Takahiro and Shunsuke Chiba, the handsome class playboy and his best friend from middle school, are having a torrid affair. With comical misunderstandings, awkward half-confessions, and the revelation that class idol Matsui Yoko is an otaku enamored with Rumi as well, poor Abe has his work cut out for him if he hopes to woo the Otaku-Type Delusion girl.

Source: Jmanga

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From Aerandria Scans:

Lately in Shibuya, many high school girls have gone missing but that doesn't stop Yaida Kirin, our guitar slinging, Tae Kwon Do wielding High School Ardor of Justice from venturing into the night to save the poor souls in need of help. It's a simple life for our heroine, but little does she know that a mysterious group of people have joined her bid for justice. Then there's Reido Serujio. What connection does he have with the mysterious group? What is he hiding beneath that weak, timid exterior of his? And why he won't stop following Kirin-san!? Is it love, like Yuki, Kirin's friend, says?

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In the Little Busters! Ecstasy (EX) series:

V.1 - Tokido Saya - School Revolution

V.2 - Sasasegawa Sasami - Black Cat Fantasia

V.3- Futaki Kanata - My Minroud

Severely allergic to felines, Yuuto Amakawa spends his mornings nursing a drippy nose courtesy of his friend Rinko’s cat. But on his sixteenth birthday, it’s not just Rinko’s pet that’s riling up his allergies (to say nothing of his hormones)! Appearing before him is Himari, a buxom, sword-wielding cat spirit in human guise, who has sworn to protect Yuuto, now the target of vengeful spirits! It’s clear that Yuuto’s allergies are the least of his problems — he’s gonna need Himari’s help if he wants to live to see his seventeenth birthday!
(Source: Yen Press)

From Village Idiot: To Minagawa Ichiri, both good things and bad things are bothersome. That's why his principle is to avoid doing anything that would cause such a thing. However, there is one thing that he can't avoid - because of his parents' jobs, he was constantly transferring from school to school. This time, he has transferred to Reimei Academy, one of the five famous private academies called the "Seven Sisters." On his tour of the school with vice president Kirishima Shitone, an attack occurs! The attacker seems to go after people with long black hair and a sword in an attempt to find and exact revenge on "Double Edge," who killed one of her best friends using a power called "Idea," where she brings her principles into reality using a wrist band called "Codec."

From AnimeCouncil²:

After establishing contact with extraterrestrial civilizations, it was found that humans were the only race to develop various sports. The number of alien sports fans grew dramatically, and the most fanatic of them regularly harass stadiums by taking part in a game, or by demanding a good show, etc. Finally, a treaty was settled, ruling all interferences towards other planets' cultures illegal. Rabbit Force, a group of rabbit-themed henshin girls, became responsible for enforcing the treaty and capturing any offenders.

Takuma Zushi just wanted to be left alone. He sleeps in class and skips club. While going home, he sees a girl walking into the woods and decides to follow her. There he witnesses a fight between two sword masters with the prize being the ownership of the "Kandachime", a sword that can take human form. That girl, Otowa Hagane was about to lose when he naively steps into the fight...

What would you do if you discovered that the world you live in is only a representation of reality? Do you surrender to despair? Or do you fight the adversities?Chess Time follows the story of several pieces on the board of the struggling eternity. These games decide the events in the world we live in, but with living pieces.

Very few people know that one of the country’s leading erotic novel author is 15 year old Akutagawa Taketo that has just entered as a freshman at Hirameki Academy. Unlike regular high schools, this school only accepts those who are accomplished or geniuses in their particular field, ranging from authors like Taketo to mathematicians or musicians. Taketo feels comfortable being in the presence of other brilliant minds but is afraid that his talent might project as him being perverted. Is Taketo going to be able to keep his secret?

From MangaHelpers:
One day, high schooler Nishiura Kenichi was tasked to check if his classmate, Kurama Shion, was still alive. Shion has not shown up to her classes in the past two months, and the teachers were getting worried. When Kenichi arrives at her place, she decides that he would make a good test subject for her recently acquired black magic powers. With her black magic curse, she turns Kenichi into her personal slave.

In the far future, humans abandon the devastated Earth and move to the upper world "Tenjo". But Tenjo and the law of causation collapse by a war and humans return to the Earth, which has turned into an inhabitable planet except for the Shinshu area. Shinshu is too small to accommodate all the humans, so they duplicate the area and create "Juso Sekai". In order to rebuild Tenjo and the law of causation, the returned humans start reproduction of history from B.C. 10,000. When the reproduction completes until A.D. 1413, a war breaks out in Shinshu and Juso Sekai falls onto the original world. The humans living in Juso Sekai lose their land and invade the original world. People in Shinshu surrender and is divided by the invaders from Juso Sekai. They try to resume the history reproduction from A.D.1457, but the update of history terminates in A.D.1648. A rumor of apocalypse begins to spread around the world.

They have been maintaining the balance of Yin and Yang since ancient times. Whenever the world is in chaos, there are many cases where evil spirits come to do harm to humans. The gods select talented humans and they are given their own guardian god for them to calm the over flow of Yin. This has continued all the way up to the present, so those that are chosen by god are hunters that eradicate ghosts, they are called Ghost Hunters.

This manga will contain remastered graphics, and additional scenarios for Ayano Kaneko, a supporting female character being promoted to a heroine.

From Wings of Yuri: High-school freshman Komari needs to find a dorm to stay in and ends up living at the prestigious Paraso no Yakata, but only because she agreed to be Himemiya Yukio’s servant!

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From matchlocks and cellphones to kimono and TV games, the cultures are blended, a modern Era with an “Inner Palace” inside the Osaka castle!?
The only son of the Toyotomi Shogun, Hidekage, on mission with the inspection bureau “Carrion Cafeteria – Vulture”, infiltrated this harem where pretty girls are gathered. However, the girls he saw there, were fighting for show, watched from outside an aquarium-like glass case. Those are not regular beauties! This is the start of a never experienced before forbidden school life!