What She Fell on Was the Tip of My Dick Adult

The "ecchi slapstick" manga centers on part-time worker Sousuke Aikawa, who lives in a run-down apartment. One day he hears a creaking sound from his ceiling, and suddenly the resident of the apartment above his, Sunao Unyuu, falls through a hole that appears in his ceiling onto his bed. Thus starts Sousuke and Sunao's comical life of living together.