Circle Sekai no Gomibako Kara presents Cancel a Format, a Hetalia-themed adults-only Otome game! Otome games present a "harem" scenario in which a female protagonist is surrounded by a host of male suitors - in this case, the charming male personifications of WWII powers present in the Hetalia universe. Having lost her memory, the protagonist finds herself as a student at the W Academy where all of the other 'countries' are studying, and navigates through her days and locations at the school, experiencing encounters and building friendships and romances.

[From J-List]