I've Been Killing Slimes for 300 Years and Maxed Out My Level Spin-off: The Red Dragon Academy for Girls(2021)

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

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)