Sora no Otoshimono

Synopsis

Knowing that Tomoki needs a place to stay, Mikako offers him to stay at her home, and they bring along their friends as well. It turns out Mikako's family are influential yakuza. After dinner, Tomoki stumbles into Mikako at an outdoor bath, who casually informs him that his trespassing violates a family law where he must be decapitated. Ikaros stops the executioner with a brief display of her power. The next morning, Tomoki finds they are on a plane to an uninhabited island as an alternative punishment instituted by Mikako. They split up to search for food and items, but Tomoki eats a mushroom and passes out. Tomoki hears yelling and rescues Sohara, but everyone else is gone, so the two spend the next few weeks enjoying island life until a sea monster grabs Sohara. Tomoki attacks the "monster", which is actually Ikaros, covered in shells and seaweed, who has returned with a big tuna. Tomoki asks where Sugata and Mikako are, and Ikaros does a scan and then knocks down a wall panel to a room where Mikako's family and Sugata have been watching them the entire time to their amusement. Later, Tomoki and Ikaros return to find his house restored, thanks to Mikako's father, who likes Ikaros and respects her power.

(Source: Wikipedia)