Ntr Netorare Gakuen Hana No Joshi-tachi To Isekai Kara No Raihousha Side Seigi ((new)) -

Since many choices lead to subtle narrative shifts rather than immediate "Game Over" screens, keep multiple save slots at every major dialogue junction.

It depicts the emotional and psychological conflict as the "hero" watches the women around him (the "Flower Girls") fall under the visitor’s sway or magical influence. The "Isekai" Element:

For more details on the developer's library or specific release dates, you can check the Visual Novel Database (VNDB).