Asobimo planned to release in 2016 the BTOOOM! ONLINE smartphone game in Japan but as you can see it is already 2017. BUT the official pre-registration event started today which means the game going to release soon.
When the pre-registered users number reached 100 000 each of them going to receive the maximum gift package: Sakamoto and Himiko avatars with all the other gifts such as 1 avatar change ticket, 1000 B Ball, Stamina Recovery skill. Above you can watch the latest promotion video and you can pre-register from here: https://www.btooom-online.jp/#pre_register