Just download the demo from fanza or dlsite. it's free
While Karen (the blonde) and Hana (pink hair) are with MC at that point more than friends less than couple, will depend on how we play. Starting from vanilla to dirty things. At the moment I only reveal Netorare Type A: "The heroine is willingly cheating on the protagonist with another guy and enjoys every second of it. No rape, blackmail, drugs etc. involved, it's consensual sex from the very beginning."
If there is any other type we will have to wait to play the full game.