A continuation of the story from the doujinshi Tachibana-san's Circumstances with a Man.

Tachibana Kyouka, your legal guardian and adoptive mother, has a new boyfriend.

Ever since your grandfather died ten years ago, Kyouka has taken you in and raised you as her own child. You have grown to love and respect her as more than just a parent, and a few months ago, your most wild fantasies came true when Kyouka began allowing you to sleep with her. Whether it was borne out of her true feelings or maternal protectiveness, your relationship with Kyouka has never been better.

But recently, things have been strange. Kyouka avoids your touch, and she comes home from work later than before. What's going on?