Gintama: Mitsuba Arc(2017)

Gintama: Mitsuba Arc is an anime series arc that centers on Okita's older sister arriving at the Shinsengumi barracks to announce her marriage to a trader. Concerned that her brother lacks friends, Mitsuba pressures him into introducing Sakata Gintoki as his best friend—an awkward claim since the two barely know each other. Meanwhile, strange vessels have been spotted moving through Edo's waters. When Vice Commander Hijikata investigates the suspicious activity, he uncovers a troubling connection to Mitsuba herself. The arc blends the show's trademark comedy with genuine emotional stakes as family secrets and unexpected danger converge, threatening to upend the Shinsengumi's quiet routine.