There might be about 38 volumes in this series, but I am not sure. Also, there should be at least two sequels called Suicada and Suicioa.

A P.E. coach is shocked when the cool, composed swimmer Tsukishima approaches him requesting he teach her all he knows about sex. Despite her antisocial leanings, she turns out to be an eager student and a fast...

In the year 20XX, Japan was in decline because of falling birth rates. To prevent Japan from dying out, it was decided that girls who reached a determined age would be allocated to single men. "Please make a...

A popular Nocturne fantasy with battles and sex! Shizuku Kujouin, the Kaguya sisters, Megumi Ichikura and Amane Masaki — all of my subordinates are ladies from the most prestigious families in the country! I'm...

The captain of the swimming club, Yui is in a secret relationship with a teacher, Narusawa. One day, they have sex without knowing that there is a spy camera in the room... (Source: DLsite)

From MangaHelpers: This story, in the universe of Suisei no Gargantia, follows Bellows, a side character in the original series, where the planet is covered with water and humanity lives in various large fleets...

Full cover: http://i.imgur.com/fbShW9t.jpg

Gyaru, junior girlfriend, elder sister, various physical trainings with beautiful girls!! The dripping sweat, the swaying chest, and the tights stretching together--!? My eyes are glued on her naughty body...

1-4. Uninvited Dolce / Oshikake Dolce (おしかけドルチェ) 5. Can I Eat You? / Tabechatte Ii Desu ka (食べちゃっていいですか)6-7. Hedgehog's Dilemma / Harinezumi no Dilemma (はりねずみのジレンマ)

Neechan to Yobanaide (姉ちゃんと呼ばないで, Please Don't Call Me Oneechan); Comic Hotmilk 2012-05 A girl and her stepbrother end up confessing their love for each other.Are kara... (あれから…, Ever Since Then...); Comic...

Manatsu no Kajitsu 2. Lunchtime no Koibito 3. Suhada no Kyuujitsu 4. Suki no Asobi 5. Shiawase no Mune 6. Suki no Houhou 7. Ai wo Matsu 8. "Suki" 9. Okuchi de Love 10. Koisuru Futari 11. Koibito no Kiss

CTD (Constitutional TransSexual Disorder)... a rare condition that causes biological sex change. Koyuki is a boy who has an appearance that often gets him mistaken for a girl. One day, his body transforms into...