Description:

Keita has two step-sisters who love him in a lustful way and have no problems expressing it, they even are in competition about that. Much to the laughs of his friends, he endures it but when one day they come to his school to give him his lunch, he gets annoyed and explodes on them, then they confess their feelings for him in front of everyone and leave. Feeling sorry he chases after them and says that he'll study hard in order to get in the same high school as them. (Source: MangaHelpers)

Description:

Makoto meets a sweet, shy girl named Haruna helping out at the school's athletics festival. He confesses his feelings for her the next time he sees her, and she bluntly rejects him, only to call him later and ask him out herself! The source of all these mixed signals is Haruna's "evil" twin sister, Natsumi. Natsumi is the opposite of Haruna, she's a forward, crude girl bent on taking whatever she can from her twin sister. Makoto is stuck in between Haruna and Natsumi, as they viciously fight over who will win him in the end. (Source: Animexis) Included one-shots: Volume 1: Hikaru Challenge!, Detarame Machi no Kaigenshou

Description:

The one thing not ordinary about high school student Ryouta is that he has an aspiring manga artist for an older sister. She is so dedicated to her drawing that, despite being 21, she's never really been in a romantic situation. Unfortunately, when she gets her first real job, it's to write an erotic manga. Desperately, she enlists the reluctant Ryouta's help, as a 'model', to figure out how exactly to draw this sort of manga. (Source: MangaHelpers)

Description:

Yearning for of the world of erotic novels, Shiina Keisuke triumphantly joins the business as an editor. The author he yearns to work with is Kuroki Chihiro, however everyone is afraid of her because she is a devil to work for. (Source: MU)

Description:

Yousuke gets separated from his only younger sister when he's a child. after 10 years he gets some clue about his sister's location. being excited to meet his sister he goes to find her, but... (Source: MU)