When a Hobby Group Representative Meeting is held to determine which hobby groups should be allowed to keep their rooms, Rikka's failed presentation of what the 'Far Eastern Magic Napping Society in Summer' does exactly leads their supervisor, Nanase Tsukumo, to investigate what they actually use their room for. Nanase points out the 'napping' part of their group is actually a notable pastime, suggesting they have a 'siesta match' against Maple Hill High School's Siesta Club to serve as an official activity for their group. On the way home, they are approached by Maple Hill's Sui Nemuri, who sparks a rivalry with Kumin, with Rikka rushingly adding she will disband her society if they lose. Thus, Kumin begins training the others in the art of napping, teaching them to sleep in any situation. Finding sleeping at will to be much harder than they thought, Yuuta suggests they stay awake the entire night so they'll be more tired on the day of the contest, with Satone joining their activities, though they end up falling asleep anyway. Despite their disadvantage against the other school, Kumin encourages the others to give it their all, and together they win the match, allowing their group activities to continue.