Square Enix is showing off Demon's Score, from Ouendan developer iNiS, on a brand new site. We now know the rhythm action game, coming to iOS and Android, features music from an illustrious group of Japanese game composers. Those confirmed so far include Naoshi Mizuta (Final Fantasy XI), Keiichi Okabe (Nier), Yoko Shimomura (Kingdom Hearts series), and two members of Taito's 'house band' Zuntata.

There's also more background on Demon's Score's story and mechanics. The protagonist, Serenity, is "your average college girl" who suddenly finds herself attacked by demons after meeting a talking bear. As your average college girl often does. Luckily, Serenity is able to let demons possess her and then control them to her advantage, all thanks to the Demon's Score smartphone app given to her by her missing father (we're not making this up).

All that nonsense aside, the story explains what we saw at E3. Not only does each demon transform Serenity's look, but each one also has its own rocking music track from one of the composers. Astaroth, for example, transforms Serenity into a blue-haired knight, and comes with music composed by Kohei Tanaka (Sakura Wars series). The other demons apparently don't come with as much outerwear.

While the action is on-rails, the game plays like iNiS' Ouendan and Elite Beat Agents (as the above video shows). In short, players must tap, hold, and slide to the song's beat. Mistakes make Serenity take some damage, while tap well enough and she'll 'level up.' If you're a bit lost at this point, think of Elite Beat Agents mixed with a demonic version of Final Fantasy X-2's 'dresspheres', and you're there.

As the English dialogue in the above video suggests, the game is coming to our shores at some point. Square's Japanese site proclaims an Autumn window for Android and a 'coming soon' for iOS. In the meantime, you can hop over there to check out some of the game's upcoming music.