After Ren daringly saves Kyoko from a car accident, they begin to strengthen their bond together. Their minds are going crazy as they restrain their passionate yearnings... But restraint still reigns - to a certain extent! But what will happen when a romance role opportunity presents itself to Kyoko, and she finds her lover as none other... than Ren?

Sequel to Immune: Now that their lives have officially begun, Kyoko and Ren can slowly begin to experience the wondrous thrill of marriage together. But what kind of marriage would it be without the occasional speed-bumps along the way?

What if Len had gone to look for Kahoko after her strings broke?

The president decides to take them to America. Will Ren be able to make up with his parents? Now has a sequel (Family Planning)

Valentine's Day revisited. ...'“Thank you.” This close, I didn’t have to say it loudly. Perhaps I said it with more emotion than I intended, but the thought was there. What I meant by ‘thank you’ really, was ‘I love you.’'

When Kyoko goes to Ren's place for a New Year's Eve celebration, the night's events and her own beating heart conspire against her decree never to love again. Will Ren finally succeed in showing Kyoko how he feels? Will Kyoko realize her own feelings?