He wont kill, she wont die Japanese film

Rei Kosaka (Shotaro Mamiya) is a 3rd grade high school student. He is not interested in anything and lives a boring existence. One day, Rei Kosaka sees his classmate Nana Kano (Hinako Sakurai) burying a dead bee. He takes an interest in Nano Kato, who carefully deals with a bee's life, because she keeps telling him that she wants to die.