Three ship girls, Javelin, Ayanami, and Laffey were almost late as they arrived in school, while Z23 also arrived as a substitute class advisor. After having a normal time in the classroom, apart from Laffey's constant attempts to stay awake, the four girls, Z23 included, ate together at lunch and they all decided to sleep with Laffey in her dorm room. While there, the three decided to do pillow fights before sleeptime until Laffey inadvertently throws her pillow at Z23, who she just came in.