Masato finally gets a break from his mom's overbearing energy, then immediately loses the one thing keeping him sane about the whole situation. The beach episode strips away the show's usual gag structure and forces genuine stakes out of pure premise chaos. By the time memory returns, you realize how much the show earned its weird family dynamic.
Masato and his party head to the beach for a well-deserved vacation, courtesy of Shirase. Sun, sand, and relaxation seem within reach until a freak accident strips Masato of every memory he has, including all recollection of his mother Mamako. What should be a lighthearted beach getaway transforms into a race against time as the group scrambles to help him recover what he's lost. Mamako finds herself in the strange position of reintroducing herself to her own son, while the rest of the party grapples with how to handle someone who no longer knows them or their shared history. The beach setting clashes with genuine emotional stakes, creating an off-kilter comedy that balances humor with unexpected pathos. This bonus episode leans into the series' signature absurdity while testing the bonds between characters who've fought countless battles together. For viewers who've followed Masato's chaotic journey through this world, watching him encounter his companions as a stranger cuts surprisingly deep beneath the ecchi comedy surface.