Yuuta Segawa is currently in the midst of his first year as an undergraduate student. After the passing of their parents, his older sister Yuri took care of him and reared him until she asked him to watch her three daughters while she and her husband went on a business trip outside of the country.
Hina, Sora, and Miu. Yuuta reluctantly agrees, but then disaster strikes and their plane vanishes without a trace, and it is assumed that everyone on board perished. Yuuta defies the wishes of the three girls’ families and takes them home, much as his sister did for him when he had nowhere else to go and no one else to care for him. This is done so that the three girls will not be separated.
Yuuta must learn how to balance his new responsibilities as the newest member of the Street Observation Research Society, a club for people watching, and also as a father figure, while Sora, Miu, and Hina come to terms with the loss of their parents.
Now the four find themselves in a new and peculiar situation: Yuuta must learn how to balance his new responsibilities as the newest member of the Street Observation Research Society, a club for people watching, and also as