The events of R?MJ take place in the summer of 1999. Hajime and Tomowo rush to the S.T.G. Hospital after hearing their friend Ryo was in a suspicious motorcycle accident, but they're trapped in the hospital after an explosion seals their exit. Together with Aya, a nurse who looks after Ryo, Hajime and friends much find a way out while a deadly virus threatens to end their search for freedom. There's something else amiss about this hospital, however. Strange paintings depicting an ancient civilization decorate the hospital walls. Just what is the Asmos Legend?