Homeroom adviser, Kyoko, assigns Raku to rally his friends to clean the school's swimming pool. Finishing their assignment, the group decides to frolic as Raku convinces an unsociable Paula to join them. Ruri calls Raku to take her place in taking care of a sickened Kosaki, much to Haru's chagrin. However, Raku is also prompted to look after Haru after she catches Kosaki's cold. Moved by Raku nursing both sisters, Haru returns to him his locket.