Blue Reflection Sun

Blue Reflection Sun is an iOS/Android/PC game, developed by DMM Games and Koei Tecmo with Mel Kishida as character designer (stylized as Mel Kishida x Koei Tecmo Games x DMM GAMES, 岸田メル×コーエーテクモゲームス×DMM GAMES). Official sources define the game as a Heroic RPG, and will be free to play with in-game microtransactions available.