Daichi Taira and Sosogu Hoshifuri were as close as anyone could get as children. Together, they made a promise that when they got older, they would live together and get married. But Sosogu moved far away one day, and he never saw her again. A couple of years later, Daichi is a regular teen living a humdrum life. Not even his parents leaving for an overseas trip can change that. Just before the pair can get out the door, his mother gives him a bit of advice among the usual warnings: "Take care of Sosogu". Unfortunately, he cannot exactly remember who or what Sosogu is...

(Source: MU)

Sakurako Kawawa has moved into a boarding house to attend high school, excitedly waiting her first meeting with her new roommate. And who should arrive at her door but Kasumi Yamabuki?

Kasumi is absolutely stunning, but she marches at the beat of her own drum. Her carelessness awakens the "big sister" inside of Sakurako.

(Source: MangaDex)