On her way home from the supermarket, Yui felt the urge to urinate. She pressed her hand against her crotch and walked awkwardly, finally making it home, but found that she had lost her key and couldn't get in. In a bind, Yui rang the doorbell of the neighbor's house, but no one answered. At her limit, Yui couldn't hold it any longer and ended up wetting herself outside. Just as she let out a sigh of relief, she was seen by the neighbor…
