Thugs are attacking Ryoma's business and assaulting Ryoma at night. The adults around Ryoma suspect that something nefarious is going on, so they start an investigation while Ryoma works on improving security at his business.
Modern katanas are made
from Tamahagane steel.
.تُصنع السيوف الحديثة من فولاذ تاماهاغاني
Für moderne Schwerter braucht man
Stahl aus Eisensand.
Las katanas modernas
se hacen con acero tamahagane.
Las katanas modernas
se hacen con acero tamahagane.
Les sabres modernes
sont en acier tamahagane.
Le katana moderne
 sono fatte di acciaio Tamahagane.
Espadas japonesas modernas
são feitas com aço Tamahagane.
Современные катаны 
делаются из губчатого железа.