During an earthquake, the hot spring that supplies bathwater to the entire island gets blocked and must be fixed. Ikuto initially goes to the source alone, but is soon accompanied by Suzu, Yukino, and Rin who help them in removing the dirt from the well. During this time, there is another earthquake and Ikuto and Suzu fall down into an underground cavern and get out by breaking the rock which sealed the hot springs thus escaping and the hot springs are filled again.
