Kotaro Lives Alone on Netflix is a must-watch. Based on the manga by Mami Tsumura, the 10-episode anime has hilarious comedy but an underlying ache because of the circumstances surrounding the story. Kotaro Sato (Rie Kugimiya) is a 4-year-old boy who rents an apartment next door to a struggling manga artist Shin Karino (Toshiki Masuda). The story is a slice-of-life anime. However, there is no happy reason a toddler lives alone.