U2 Akiyama (あきやまうに, Akiyama Uni) is a Japanese composer and arranger best known for being a member of the doujin game circle 黄昏フロンティア (Twilight Frontier). Akiyama worked on the soundtracks for almost all games released by Twilight Frontier, most notably the three 東方プロジェクト (Touhou Project) fighting games released by the circle, and also participated to several other projects such as releases by dBu music or the soundtrack to the first episode of うみねこのなく頃に (Umineko no Naku Koro ni).