Ikuto falls overboard and drifts away onto Airantou Island. A native of the island, Suzu, takes him into her home, much to the displeasure of the other girls on the island.

Ikuto is the first man to grace the island in years, and all the girls on the island want a shot at him. A "Catch the Groom" tournament is held decide who gets to marry him.

Feeling like a freeloader, Ikuto decides he should help Suzu out with her chores, but island life proves more difficult than he originally imagined.

On an errand to the Sea Dragon Shrine, Ikuto meets Machi, Ayane's older sister. Ayane has run off, so she tasks Ikuto and Suzu with finding her in exchange for a huge batch of Suzu's favorite sweets.

One of Yukino's animal friends, a bear named Kuma-Kuma, has disappeared after being reprimanded for raiding the jam supply. Ikuto and Suzu help with her search.

An earthquake hits the island and causes the supply of running water, fueled by hot springs, to stop. Ikuto and company must find and repair the cause of the stoppage.