With roots in United States, Oyasuminasai takes part in Age of Empires II. 3 matches of Age of Empires II are on Oyasuminasai's record. Oyasuminasai primarily plays on the unranked ladder.

Ranked matches are not part of Oyasuminasai's Age of Empires II experience so far. Japanese stands out as Oyasuminasai's preferred civ with a 66.7% selection rate.