Mob is challenged to a one-on-one fight with Black Vinegar Middle School's shadow leader, Hanazawa Teruki, otherwise known as Teru. Mob doesn't use his powers but Teru goes all out on him, destroying everything around him. Teru continues to unleash his incredible power when Mob suddenly remembers a tragedy that happened between him and Ritsu...
Knives are dangerous. You shouldn't point—
—السّكاكين خطيرة، لا ينبغي أن تشهر
Messer sind für
kleine Kinder nicht.
Los cuchillos son peligrosos,
no deberías…
Los cuchillos son peligrosos,
no deberías…
Il ne faut pas pointer
les couteaux vers les gens.
I coltelli sono pericolosi. Non dovresti puntare—
Facas são um perigo. 
É errado apontá-las.
Ножи опасны, не наводи их на людей...