Grisaia Phantom Trigger Vol.2

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A VIP disappears en route to Japan, and it's up to Mihama students Rena, Tohka, Chris, and Murasaki to help investigate, with the twins from Kyousen Sakuragaoka in tow. Recovering the VIP pushes their minds and bodies to the brink, and to top it all off, Rena and Haruto’s past is revealed as well!

Source: IGDB