Visual novel game based on 2015 anime adaptation of Akatsuka Fujio's 1962 "Osomatsu-kun".

The story of "Osomatsu-kun" revolves around the Matsuno sextuplets, whose faces are all the same: Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Juushimatsu, and Todomatsu. "Osomatsu-san" tells their story 20 years later, as they try to survive in the middle of the modern era.