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.

The story centers on Takeda, a 47-year-old general manager of a company who one day is turned into a baby (despite his mental age remaining the same) and the antics of him and his subordinates.

Ichitaro, the young master of one of Edo's leading shipping agents, is too weak to go out on a regular basis. However, on a night when he is allowed to go out under the watchful eye of his handmaiden, he witnesses a murder…?

Anthology

Do not overlook any unusual behavior. If you notice anything unusual, turn back immediately. If you do not notice anything unusual, do not turn back. Leave from Exit 8. (Source: Shogakukan, translated)

Kokome is a first-year high school student who is so petite she is often mistaken for an elementary school student. Together with Yukari, her very mature-looking best friend, she joins a manga and animation club at their school, led by Mimika, an elementary-age prodigy.