Nobody Knows

Akira Fukushima (Yuya Yagira), a 12-year-old boy, takes care of his younger siblings after their mother leaves them and shows no sign of returning. The children, including Kyōko, Shigeru, and Yuki, are half-siblings with different fathers, living in a small Tokyo apartment without being seen by others. Their mother's absence forces Akira to survive on his own, relying solely on his siblings as they face various challenges together.