The story of Higepiyo (literally “Mustache-Peep”) revolves around Hiyoko, a “surreal” bird that happens to have a mustache. Hiyoko can talk with “Piroshi” — Hiroshi, the human boy who bought her at a night fair — and the two are tight friends. In fact, Hiyoko teaches Hiroshi how to win brawls in elementary school, and she sometimes fights a bullying girl on Hiroshi’s behalf. (Hiyoko is actually an experimental test subject that escaped from a laboratory.)