One-Punch Man

Season 0, Episode 2

Episode Title: The Shadow That Snuck Up Too Close

Air Date: 2015-12-24

Overview:

A story set sometime between Mosquito Girl’s defeat and Genos showing up to Saitama’s apartment. Genos wants to learn the secret to Saitama’s power and decides to follow him and to observe everything he does. At the same time, Saitama is convinced that someone is stalking him.