Description:

High School junior Takanashi Nao has a problem: she has a crush on her dreamy older brother, Shuusuke. Fortunately, when Nao discovers that she was adopted as a child and they’re not related by blood, it seems like the coast is clear—but Shuusuke just doesn’t see it that way. To make matters worse, Nao finds herself in direct competition against Shuusuke’s hot childhood friend, Iroha, not to mention class president Mayuka. As all three girls vie for Shuusuke’s attention, Nao soon learns that all is fair in love and war! (Source: Seven Seas)

Description:

Yuu is famous for having an extreme brother complex. In reality, she has emotions for her little brother, Hiro, which have far exceeded a normal sisterly love. A little complicated family love comedy from the author of "Hyakko." This is a story of forbidden love with an older sister, a younger brother and their half sibling Tomo as well. (Source: M-U)

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:

Hozuki Gorou is your average high school student in all respects, except for having a crush on his sadistic older step sister, Haru. Haru delights in toying with her step brother: flirting, deceiving, and humiliating him at every given opportunity. Serialized in Young Ace, Igarashi Ran's 4-koma crack comedy follows the relationship between the two step siblings and the troubles of their daily life.

Description:

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. (Source: MU)