1 Season · 36 Episodes · Premiered April 15, 2017 · Ended December 16, 2017
A girl named Yūka encounters a being from the depths of the Earth named Chii-chan (a pun of 'Chiteijin,' the Japanese word for underground-dweller), and an alien named Ucchan (a pun of 'uchū jin,' or 'alien'.) The two beings begin l iving with Yūka who promises to protect them.
