Okuno Kokoro (Sora Tamaki) is a first year high school student from today. After being sent off by the leisurely mother Hana (Akiko Kikuchi) and father Jun (TAIGA), she headed to high school with excitement. When I get to my seat, I can't help but notice Asuka Torii (Ten Yamazaki) in the next seat. The sleeves of the cardigan are ridiculously long! When I was asked, "Isn't the sleeves stretched right away?" And looked around the classroom, there were certainly students with various sleeve lengths sitting. "High school is amazing!" The curious heart is to sneak after Asuka, who says "I'm going to cut after school." And I arrived at the "sleeve salon". There, the heart is greeted by charismatic Sodeshi Masato Karis (Yosuke Sugino) and steps into a glittering unknown world ...