Grisaia Phantom Trigger Soundtrack 02 and Grisaia Phantom Trigger Vol.8 Ending Theme Song are now available!
https://store.steampowered.com/app/1881630/Grisaia_Phantom_Trigger_Soundtrack_02/
https://store.steampowered.com/app/1881640/Grisaia_Phantom_Trigger_Vol8_Ending_Theme_Song/
Grisaia Phantom Trigger Soundtrack and Vol.8 Ending Theme
Source: Steam Community (opens in a new tab)