Airplane Named Seryozhka

A handicapped boy stuck in a wheelchair dreams of having a friend. Just when a toy airplane flies into his hospital room and magically turns into a boy, who takes him on an outing he will never forget.

Soft Rain or Another Story of Mowgli

It's post-apocalyptic future. The group of boys does not realize that one of them is not quite a person... he's the "Mowgli Project". It is also unknown whether Mowgli himself knows about this.