Haruka Tsuchiya, an unassuming university student, shares her life with Okojo-san, a pet with a mysterious mountain origin. Okojo-san, an escape artist at heart, finds his way into Haruka's home, sparking a series of comedic and peculiar events involving eccentric characters and animals. This whimsical anime thrives on the absurd, weaving a tale filled with outlandish humor and zany escapades.