Hell’s Hot Springs: Alien Girls and Colorful Exposed Bodies

Lala is seen watching a commercial on tv about the Tsumata Misami Hot Springs. She then tells Rito that she wants her own hot spring. Rito finds Lala attempting to build something in their yard. Lala then asks Rito to go get her a drink, so Rito heads to the store where he is suddenly attacked by Yami-chan as a test.

Synopsis excerpt via Kitsu.