Sean

Here's the translation of the tweet: "Tomoki Nishiyama is currently working on music with REIJI, who he was with in Japan, and SOMA and MASAYA, who he was with in Kyoto at WARP sROOT, as well as Sean, who he was with at ASY. It's like I'm getting a fast-forward glimpse of Nishiyama's journey so far 😊 Thank you!"

西山智樹くん アメリカでは日プで一緒だったREIJIくんと 京都ではWARP sROOTで一緒だったSOMAくんとMASAYAくんと ASYで一緒だったSeanくんと楽曲制作中 まるで、早回しで西山くんのこれまでの足跡を見せてくれてるみたい😊 ありがとう

The tweet translates to: "I wonder if Nishiyama-kun has deeper interactions with people who create music, like Reiji-kun from NIPPON, MIZUKI-kun from WARPs, and Sean-kun from ASY."