While all the classes were consumed in preparation for Shuchiin Academy's Hoshin Culture Festival, Shirogane and those from Class 2-B were working hard at making balloon art. As Fujiwara delicately puts finishing touches on a cute balloon bear, the clumsy Shirogane keeps popping them no matter how many times he tries. The sound of balloons popping echoes sadly in the classroom. But Fujiwara, who has joined Shirogane's special training many times up until now, hardens her heart and decides not to help this time. To overcome this without the help of others, Shirogane heads to the student council room for practice. However, Kaguya is in the room...

Invited to walk around the culture festival together by Shirogane, Kaguya is unable to hide her surprise at this sudden plot twist. She lightly joked that maybe he was affected by the festival's atmosphere, but Shirogane never dropped his serious expression. Compelled by such intensity, Kaguya decided to walk around the school together. Everyone around them gossips that they are on a date as Kaguya blushes. But while they enjoy visiting a love fortune-teller, food shops and live music, Kaguya feels true happiness. From the depths of her heart, she wishes that each day could continue just like this.

Shroud in a cape and dressed in the guise of the phantom thief Arsène, Shirogane waited for Kaguya's arrival atop the clock tower roof overlooking Shuchiin. When asked why he would do such a thing, Shirogane answered that there was something he wanted to show Kaguya. The festival's afterparty has already begun as the sun set over this school and the students could be seen encircling and enjoying the bonfire. While the emotions that could not be expressed with words mingled between Shirogane and Kaguya's hearts... Shirogane carried out his ultra-romantic operation!!