Last week on Friday, Yusuke Kozaki published a teaser video on the Twitter but nothing exactly details released about it, until now.
The video made for a new LINE collaboration game for the Reconquista which release in 2016 Autumn in Japan on iOS and Android devices as a free to play RPG game.

The pre-registration of the game already started where you can get extra rare cards and items depends on the registered users number. The highest goal is 300 000.
On the official website you can register and above you can watch the full version of the promotion video!