High School DxD, tome 04 : Vampire of the Suspended Classroom
Ichiei Ishibumi2021

After the recent trouble with fallen angels and Excaliburs, Rias is finally allowed to unseal her first Bishop—Gasper. Issei is thrilled to find that this new addition appears to be a cute blond girl...but his hopes are quickly dashed. Not only is Gasper a cross-dressing boy, he’s also a total recluse with the power to freeze time! As if getting a shut-in to come out of his shell wasn’t hassle enough for poor, perverted Issei, a peace conference among demons, angels, and fallen angels being held at his school is beset by terrorists! Could this mean the beginning of all-out war?