- 2017-01-01 David forms and joins CHATEAU AGENCY.
- 2017-01-24 David officially starts.
- 2017-03-08 David participates as the opening act of Visual Parade presents Metal? at Toyosu (豊洲) PIT.
- 2017-04-08 First live is held in Tokyo (東京).
- 2017-04-25 David performs at Versailles Ba. MASASHI birthday event, Dark Matter Party at Shin-Yokohama (新横浜) NEW SIDE BEACH.