Love, That's an Understatement Vol. 4 (Kodansha, 2024)

Locked out of her house late at night after losing her keys, Risa finds herself staying over at Zen's. She isn't sure what to expect at first, but is immediately made to feel welcome by Zen's warm and lively family. His sister offers Risa a spot in her bed, so Zen can't sneak by for a nighttime rendezvous. But half asleep after she gets up to go to the bathroom in the middle of the night, Risa wanders back into the wrong bedroom…