A beautiful day Rokurou, a student, was to masturbate when a beautiful girl knocks on his door: You need a virgin? And so begins the story. Rokurou did not know what it was that this beautiful girl was a millionaire family.

In a quiet corner of the city, four-year-old Kun Oota has lived a spoiled life as an only child with his parents and the family dog, Yukko. But when his new baby sister Mirai is brought home, his simple life is thrown upside-down; suddenly, it isn't all about him anymore. Despite his tantrums and nagging, Mirai is seemingly now the subject of all his parents' love. To help him adapt to this drastic change, Kun is taken on an extraordinary journey through time, meeting his family's past, present, and future selves, as he learns not only what it means to be a part of a family, but also what it means to be an older brother.

A short OVA that was bundled with the limited edition of the eleventh volume of the manga.

A bridge's legend tells that when two people meet on it, they will surely meet again. Momo meets a boy who doesn't believe the legend, and promises that she will meet him again to prove it. As the year passes, she comes every day to wait for him, and becomes a small part of many people's lives. (Source: ANN)