In the home of Ichika (Renka Iwamoto), there is a piece of yellow tape dividing the family space into two.This tape was put on by her mother Kazumi (Katayama Moemi) under the influence of her father Reitaro (Takezai Terunosuke)'s words.Ichika longs for the rebirth of her broken family, so she begins to explore what happened between her parents.In order to respond to his daughter's wish, Lingtaro decided to explore the root cause of the breakdown of the relationship between the couple.However, as Kontaro crosses the tape, the family's collapse seems to become more and more uncontrollable.Ichika blames herself and thinks that all this is because she wants to solve the family mystery.

Under this circumstance, Ichika met Hikaru (Tanaka Gouki) who had transferred from Tokyo.They have the same interest - they all like to play the same guessing APP.Hikaru grew up in a single-parent family. In order to escape his mother's fanatical suitor, he moved to the small town where Ichika was.Ichika empathizes with Hikaru's situation. They both grew up in complicated family environments and escaped from reality by becoming obsessed with guessing.

As a result, Ichika confided to Hikari all the sense of disobedience in the family, and Hikaru suggested that we solve the mystery together and planned a certain plan for Ichika.

Then, the two began to work hard to reconcile Kazumi and Reitaro, who had not been in contact with each other for a long time.In the end, Kazumi decided to confront Reitaro and gradually got closer to the core reason for posting the tape.Is that piece of tape a revenge against Prince Taro, or is it Kazumi's unreasonable domestic violence?——.