Overview

Sumire's sexual desire was so strong that her boyfriend asked her to break up with him. One day, when she was looking for something in her younger brother Katsuhiko's room, she found an unused shoulder ticket she had made for him a long time ago. While her parents were out on a trip, they found Katsuhiko masturbating outside her room, masturbating as much as she wanted. Sumire remembers her shoulder slapping ticket, and she presents it to her as a ``vagina slapping ticket,'' which she hopes will help her use up all the condoms this time. While her parents were away, her siblings were able to share their sexual desires with each other.