Liberty - Your Last Chance

You're getting married to Liberty, the woman you fell in love with during college. You are nervous, but your good friend is your best man. It's getting close to the time, but your best man is missing. As you search for him, you walk past the dressing room where Liberty is getting ready. You hear a noise, something out of place. You slowly open the door without announcing yourself.

Netorare (寝取られ) — The protagonist’s partner is taken by another, with the emphasis on the emotional impact—loss, jealousy, or betrayal—caused by this being taken away.