For some reasons, Koudai has never been my cup of tea. However, I hope he is doing well with his new adventures.Not really, LOL. Koudai (輝大) (or Fumiya at Men's Rush, if you're more familiar with that name) has since moved to Franceto pursue a porn career with Mature.nl studio which focuses on sex with older ladies & he has also changed his main stage name as Daiki.
He has purged his old sns accounts & now has a brand new open-for-public X account. He has apparently recorded many scenes for SAMOARI's Boys Love brand before leaving Japan, that's why there are a lot of new stuffs of him from that studio coming out recently as well.