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Yamanashi Kazuya is a first year Artist in Eisen High School's Perception Art Department. He's looking for his childhood friend, Takise Kyo, who is a third year Grader, but students from the two specializations are not encouraged to mix.

The Generals give the Staircaser candidates a chance to trade partners for the contest, but this leads to a fight between Artists and Graders instead.

As Kazuya and Kyo start working together on their piece for the Staircaser Contest, Kazuya reflects on their relationship and the relationship between Artists and Graders.

The Graders have a curation meeting to decide where their pieces will be displayed for the Staircaser Contest, and Kazuya wants to join, but Kyo won't let him.

As Kazuya helps look for the culprit behind the mysterious Scribble, he talks to Anjyu and finds out about the stress he felt because of the Staircaser Contest.

Kazuya and his friends find themselves in the middle of a fight between Mikuriya Kaede and Kirinoe Mashu in their search for answers about the mysterious Scribble.

Kazuya and Kyo go see Haijima Iori's exhibition, and Kazuya learns more about Iori's relationship with Kyo and with Takumi, his Grader for the Staircaser Contest.

Kazuya thinks back to the time right before his parents' death and his family's relationship with Kyo's family during that time.

With the supported space update coming soon, Kazuya and the others are running out of time to find the Scribbler, but Kazuya is fighting with Kyo and Jun.

In his search for the Scribbler, Kazuya learns more about Kyo and Iori's relationship when they were partners for the Staircaser Contest two years ago.

Kazuya finally realizes who drew the mysterious Scribble and finding the Scribbler leads him to answers about his past and the day his parents died.