Sh@pple

Comedy Romance Gender Bender

The protagonist, Awaya Yukiguni met a girl named Isuruga Mitsu and fell in love with her at first glance. Later, he learned that Mitsu is commuting in an all girls school, the same school that his sister attends. So in order to approach and become closer to her, Yukiguni decided to attend the all-girls school in place of his twin sister. (Source: MU)

Durarara!! SH

Action Supernatural

A year and a half after the end of the first series, there is a meeting between a boy—traveling to Ikebukuro in the capital to seek the Headless Rider—and a girl, whose older sister vanished chasing it. Thus, the extraordinary begins! (Source: popsiclete, edited)