My Beloved Wife's Secret Account

Yamada Sousuke, a man with a daughter in elementary school, happens to see a video on a secret social media account (ura-aka) showing someone who looks like his wife having sex. The video was filmed at the elementary school his daughter attends. Sousuke, heartbroken by his beloved wife's infidelity, vows revenge on the other man. The candidates are 5 fathers participating in the PTA