Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita Spin-off: Red Dragon Jogakuin  

I've Been Killing Slimes for 300 Years and Maxed Out My Level Spin-off: The Red Dragon Academy for Girls, スライム倒して300年、知らないうちにレベルMAXになってました スピンオフ レッドドラゴン女学院

Laika has settled into the role of a rather prim young lady at the house in the highlands—but was she always that way? Or was she more of a hot-blooded dragon...as red as her scales? In the second spin-off of the Killing Slimes series, the school days of Azusa's oldest companion will be revealed!(Source: Yen Press)

Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita Spin-off: Red Dragon Jogakuin has been published in English as I've Been Killing Slimes for 300 Years and Maxed Out My Level Spin-Off: The Red Dragon Academy for Girls by Yen Press since August 22, 2023.