They are somewhat of a Nagoya-kei supergroup: Ryo (ex-9GBO, HOLLOWGRAM, etc.) on vocals & aie (ex-deadman, the god and death stars, etc.) on guitars most notably.
Bonsai, unless you've listened to the groups each member is/was a part of, then you may not get the hype. Each individual had a certain sound that made them distinct in the VK scene, most notably Ryo (ex:9GOATS BLACKOUT) and Aie (Ex: The god and death stars)