Maya nearly gave up until she found a tiny footnote: In 2019, Rejet released Diabolik Lovers: Grand Edition for the . That’s the only modern "new" release. Still no PC. There is also a mobile app, Diabolik Lovers: Lost Eden for iOS/Android (Japan-only), but again, not Windows.
Since Diabolik Lovers is a Visual Novel, you want the text and artwork to look crisp.
Depending on which game you want to play, you will need an emulator.