Do You Love Your Mom and Her Two-Hit Multi-Target Attacks?: Do You Love Your Mom on the Shore?

Unaired 13th episode. To thank the group for all their hard work in the past, Shirase invites the party to enjoy the sunny beach. While enjoying the wonderful weather and pristine waters, an accident causes Masato to lose all his memories, including those of Mamako! (Source: Funimation)

One Room: Second Season -extra-

One Room: Extra special included on the BD release of the main show. It follows bedroom 'role play' scenarios you have with the girls and dream scenarios you have while asleep near the girls.