From PROzess:
Sakurai Sakuya is a first-year student that hates summer. One day when he's verbalizing his hatred towards the sky, he is spotted by Kisaragi Haruka, a second or third year student. (It's only said that she's senior to Sakuya.) Haruka is the only member of the art club of the school and ask Sakuya to model for her. He agrees not knowing it would be a nude model. Sex ensues. Sakuya thinks that this is the end between them, but Haruka warmly sees him off with the words "See you tomorrow". Thus their fragile love begins.

A boy falls in love with a girl, who is the student council president of their school.

Unable to confess, he is gifted by a deus ex machina when he innocently uses his cell phone camera to spy on her. On one of his playbacks, the boy realizes that the girl is not wearing any underwear.

Aki Sora revolves around Aki Aoi and Sora Aoi, a pair of close siblings who have shared an intimate bond since childhood. During their coming of age, they each come to realize the true depth of the love they feel for each other and consummate that love in secret. They keep their younger sister, Nami, Sora’s twin in the dark about their new relationship. Nami, clueless of what is happening in her household aims to set her brother up with her best friend, Kana Sumiya. Despite these relationships Nami seems to have feelings for someone near to her too but keeps them secret.

Note: The first and third volumes will no longer be printed following July 2011 due to the Tokyo Youth Development Ordinance bill due to its depictions of incest.

Yukiteru is living with his family friend Yuno after a fire burnt down his home as a child. They live their life until a fellow classmate Rena who is jealous of their close friendship makes a surprise move.

Kuro is a high school student who leads a gloomy life - has no friends and no girlfriend. But one day he gains the ability to put his soul into any inanimate object, and thus his glorious peeping career began.
(Source: MU)