Houkago, Nikoichi Kurashi

Nico is living with her grandmother while her parents are transferred overseas. She finds rural life inconvenient, but thinks it'll be comfortable once she gets used to it. She's startled by the creaking of the house and laments, "Old houses are scary after all!" Just then, a gecko appears! Nico is suspicious of the "house guardian" who has been protecting the house for a long time.

A city-bred girl and her guardian deity begin their strange cohabitation!

(Source: Shogakukan, translated)