Kae has been taken away and Kawaki must face a dangerous assassin. Himawari acts as his partner and provides support during the battle. They try to corner the enemy with coordinated attacks, but the enemy proves to be powerful. Meanwhile, their classmates, who had entrusted Kawaki and Himawari to directly confront the assassin, take action in a desire to try to help. Will Kawaki be able to save his precious friends and accomplish his mission?

But if she dies, then Hana Sensei will too!
!لكن إن ماتت، ستمت هانا-سينسي أيضًا
Aber wenn sie stirbt,
dann auch Hana-sensei!
Pero si ella muere, la maestra Hana…
Pero si ella muere, la maestra Hana…
Ma se la ucciderai, 
morirà anche la maestra Hana!
Mas se ela morrer,
a professora Hana também vai!
Но ведь… если ты убьёшь её,
то и учительницу тоже!