Rio secretly has feelings for his adoptive father, Yuji. One day, Yuji catches Rio masturbating! Yuji doesn't know how to interact with Rio now that he's all grown up, and Rio's feelings for Yuji grow every day. Where will this awkwardness between them lead? While trying to keep his current relationship with Yuji, will Rio be able to hold back from going after the defenseless Yuji?! A serious high school student and adoptive father BL story!