High schooler Riku had sneakily given her sleeping teacher Sano a kiss in the reference room a year ago. Despite the potential consequences, he had warned her to keep their moment secret.
Now, in the present day, Riku finds a note on her desk directing her back to the reference room. When she arrives, she is surprised to find a blindfold tied around her eyes with a dark blue necktie. The voice behind her instructs her to keep the encounter secret before kissing her.
When Riku finally removes the blindfold, she is bewildered to see her once-older love interest suddenly appearing her own age.
