Those who the Tamakoma Branch members happened to meet at a barbecue restaurant are Ninomiya Squad agents, their opponents in B-Rank Wars Round 8.
After getting back to the branch office, Osamu and the other members start developing plans for their final match.  However, a question posed by Hyuse to Chika creates a ripple.
Should be weaker than glass
A bullet should pierce through
Eine Kugel kann ganz leicht durchdringen,
da ihr Ziel nun zerbrechlicher als Glas ist.
Plus fragile que le verre
Une balle de plomb suffirait à le transpercer
Sendo tão fraco quanto o vidro,
uma bala seria capaz de perfurar
Должна быть хрупче стекла,
пуля легко пролетит навылет.