Washio Sumi wa Yuusha Rajio

Washio Sumi's Hero Radio is the spin-off Web 4koma to promote both the light novel and movie version of Washio Sumi is a Hero. "Washio Sumi's Hero Radio" features Washio Sumi, Nogi Sonoko, and Minowa Gin.
It consists of 30 chapters and 9 bonus chapters.