OVA bundled with volume 22 of the manga.

Ishigami and Shirogane share a mutual love of a certain manga- but their friendship is tested by whether or not they can admit to being otaku. Will their social lives survive? A special 10 minute adaptation of chapter 110 of the Kaguya-sama manga that serves as the preview for season 3.

With the culture festival over and the world dyed in the Christmas mood, Shirogane recalled the kiss on the clock tower, desperately trying to understand Kaguya's true intentions. Kaguya, on the other hand, gleefully told Hayasaka the events. However, the next day, a shrunken Kaguya appeared in the student council room for some reason. While everyone is concerned, a trial begins inside Kaguya's brain!!

Kaguya has frozen her heart as a result of the trial in her brain. Shirogane was unable to hide his turmoil as the Kaguya who stood before him had radically changed from the day before. Shirogane tries to talk to Kaguya to solve the situation. But she runs away, and a chase within the school suddenly begins. Finally, as Shirogane catches up, he shares his thoughts.

After she saw Shirogane's bento lunch box during the lunch break, Kaguya tried to tempt him indirectly for a single bite. He noticed her actions, but due to a certain happening, the distance between the two rapidly closed. However, Kaguya's daring actions cause Shirogane to lose consciousness. While staring at Shirogane asleep in bed, inside Kaguya's head, she is...

Christmas Eve. Friends and lovers. Everyone spends time in their own way. Shirogane and Kaguya, who joined the Fujiwara Family's Christmas party, enjoyed the Fujiwara Family's brand of hospitality. As the fun time passed quickly, they found themselves on the way home. The two, who cannot express their honest feelings, sit side-by-side on a park bench.

Shuchiin Academy's student council room – the place where Vice President Shinomiya Kaguya and Student Council President Shirogane Miyuki met. After a long battle in love, these two geniuses communicated their feelings and, at the Hoshin Festival, had their very first kiss. However, there was no clear confession. The relationship between these two, who assumed they would be a couple, remains ambiguous. Now, overly conscious of their feelings, they must face the biggest challenge yet – Christmas. It's Shirogane who wants it to be perfect versus Kaguya who pursues the imperfect situation. This is the very "normal" love story of two geniuses and the first kiss that never ends.