Gintama, 8

Gintoki has to rescue the only son of a yakuza boss who had locked himself in a warehouse, but it turns out there was a different person inside. Furthermore, at that moment, the young second-in-command of the yakuza group draws his sword against him. Other things also happen, such as Hasegawa making sushi, a mysterious, annoying bacteria, an alien hunt, and Katsura's prison escape.