The only time I wish the mangaka would've milked a series. This doesn't need the 100 days limit. It can just show their daily lives and everything. Heck even Aoki said it. They live in the same freaking town. They could just go to each other's house to play. Or Shuto could just babysit Chiko whenever her mom is busy. This, Gakuen Babysitters and Yotsubato are the holy trinity of child raising manga.