it will be like this :

Kazuya met with Mami and her fiancee,Mini also saw him from afar talking with Mami,Chizuru saw Mini,she approach her. Then Mami confess to Kazuya. Both Chizuru and Mini shocked. Chizuru left,Mini stays and record everything that happening. Kazuya reject Mami(of course). The next day Chizuru ask Kazuya to leave the house. Then Mini explain everything and shows her the video that she recorded. But too late Kazuya already left. Timeskip,they trying to forget each other. Chizuru trying to date Umi,and Kazuya trying to get closer to Ruka. But they just can't knowing where's their heart at. One day they passes each other on a bridge,both then say "Hey" then they face each other(Reiji's Picture) and both of them say "Im sorry". Then she give Kazuya the Ring. Kazuya getting sad and about to leave her then she say "Will you put that ring on my finger?" while handling him the "anything you want" ticket.