My Girlfriend Was Stolen From Me, but I Was Trained by the Four Heavenly Kings of B*tchy Gals at School (Including My Childhood Friend) and Before I Knew It, I Had Become a Monster

彼女を寝取られましたが、学園のビッチギャル四天王（幼馴染含む）に鍛えられ、気づけば化物（モンスター）になってました。