Kids Are Angels?

Hiroshi, a 40-year-old man with no real social experience, is told by his girlfriend that she is pregnant. He flees back to his parents' house and is confronted by Shunta, a boy who played an active role in the Sentai TV program. Hiroshi is forced to teach Shunta how to study, but... This is a story of one summer between a man who can't grow up and a boy who has no trace of childishness.