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?

I also need to protect my little brother,
،أنا أيضًا بحاجة لحماية أخي الصغير
Außerdem muss ich meinen Bruder beschützen,
der in das ganze Chaos hineingezogen wurde.
Y debo proteger a mi hermano,
que acabó involucrado.
Y tengo que proteger a mi hermano,
que acabó involucrado.
Também preciso proteger meu irmão,
К тому же мне нужно
защитить братика…