有明/Ariake is an original song commissioned for maimai DX PRiSM, created by the enigmatic artist SIINCA. Little is known about SIINCA, the name is widely regarded as a pseudonym, and no public appearances or other confirmed works under this name have surfaced, giving the track an air of mystery that matches its lyrical and visual themes. The song accompanies a richly atmospheric narrative: a flavor text describes a primordial myth in which a scorned child wages war against the gods for the sake of the one person who showed them kindness, culminating in a desolate battlefield where a man filled with dark triumph walks toward a temple, a story of "how it all began." The track is part of the KALEIDXSCOPE in-game event, specifically unlocked by completing the Purple Door (紫の扉) course, where it appears as the third song. It also belongs to 言ノ葉Project 2nd Season (Kotonoha Project), a series within maimai that pairs original compositions with narrative-driven presentation. The song's production team includes illustrator しきみ (shikimi), a well-known artist in the doujin and VOCALOID art scene, and video artist kotose, whose visual direction brings the mythological flavor text to life. At 190 BPM, the track is a fast-paced, driving piece that matches the scale of its mythic storytelling. The Master chart, designed under the alias BLaCK rOSE dIsEASe pATiENT, a name that thematically echoes the KALEIDXSCOPE black rose motif, offers a dense 945-note layout at level 14.4.