Sousuke Aikawa is a lazy part-timer living in a rundown apartment. His only joy is the kind and sexy landlady Yuki. When the noisy girl upstairs, Sunao, turns out to be just as cute, he tries to complain — but the old ceiling collapses, sending Sunao falling right on top of him in the most intimate way possible.

What starts as one lucky (and very wet) accident quickly escalates. Yuki takes responsibility for the hole in the ceiling and moves in with Sousuke, while Sunao keeps “falling” into his bed. Soon a childhood friend Yuzu joins the chaos, turning the tiny apartment into a harem playground.

Jealousy, peeping, shared baths, beach trips, theater dates, and risky public teasing lead to endless erotic situations. The girls compete for Sousuke’s attention while trying to hide their growing feelings, resulting in passionate threesomes, secret quickies, and hilarious close-call moments.

Will the love triangle collapse like the ceiling, or will Sousuke manage to satisfy all the beautiful women living under one roof? Packed with uncensored vanilla harem action, this short and sweet series is pure ecchi comedy bliss.