Ryūichi Sumeragi (皇樹 龍一 Sumeragi Ryūichi) is the second protagonist of fortissimo EXS//Akkord:nachsten Phase. Ryūichi is an old friend of Reiji. Like the latter, Ryūichi is also an orphan who lost his parents in the war; however, he was adopted by another war survivor and travelled with him around the world before returning to Tsukuyomi-jima at the beginning of the story.