The recent mobile entry in the franchise is now available to download on the Japanese iTunes & Google Play Store for free!
Core app size appears to be 197 MB. However, this doesn't include the extra content that has to be downloaded after the initial launch, so be wary of that before downloading the game.
iTunes Store App Page | Google Play Store App Page
To celebrate the release, Bandai Namco also released a commercial of the game on Youtube:
Tales of the Rays
Tales of the Rays is a Tales mobile game for the iOS and Android featuring characters designed by Hidenori Matsuraba and a new ADF-LMBS (Advanced Flick Linear Motion Battle System). The game tells the story of hero Ix Nieves and heroine Mileena Weiss in the world of Tir Na Nog. Characters from the previous Tales titles appear in this game.
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