All 4 members of Busaiku will be starring in a new drama together called ￮￮Na Hito no Matsuro
The 1st episode of ￮￮Na Hito no Matsuro will be aired via NTV on 23rd April
https://natalie.mu/music/news/271238
It wouldn't surprise me if Busaiku will provide the theme song for ￮￮Na Hito no Matsuro