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.

[Written by MAL Rewrite]

Short specials included in the Onii-chan Dakedo Ai sae Areba Kankeinai yo ne Blu-rays and DVDs.

Valt Aoi is a hot-blooded kid who loves to attack and wields a Beyblade named Valkyrie. His close friend Shuu Kurenai is an elite Blader who is a genius but still puts in a lot of effort, and wields the Beyblade named Spriggan. (Source: ANN)

Unaired episodes included in the Blu-ray box volumes.