The Hot Spring is Warm
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.
Aired 10/05/2007EP 6 - The Hot Spring is Warm

Nagasarete Airanto
After a terrible argument with his father, Ikuto makes a hasty, fateful decision to run away from home. Going from runaway to stowaway, Ikuto’s luck lands him on a ship heading right into the path of a huge storm! When it rains, it pours — or in Ikuto’s case, it pours so badly that he washes overboard and wakes up on a deserted island. Well, an almost deserted island. The island is populated by nothing but beautiful girls, all of whom want Ikuto to choose them as his bride.
(Source: HIDIVE)