The young man living next door to the neighbor Mizuki Aiga, although she is married, finds himself enamored with her every day because of her youthful beauty and sweet voice, as they share a wall. One day, when he returned home late after working overtime, he saw Mizuki standing at the door with a drunken expression, completely lost about how to get inside. As soon as he arrived home, she immediately hugged him, thinking her husband had come back, and then slipped his pants off to have an intimate moment right at the doorway, perhaps believing that they were inside their home together:))) Unexpectedly, he found himself in a situation with a beautiful woman.