100-nin no Eiyuu o Sodateta Saikyou Yogensha wa, Boukensha ni Natte mo Sekaijuu no Deshi kara Shitawarete Masu - Ch. 14

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The protection was so the rubble wouldn't harm the students, but trap them underneath the pile of collapsed building. Wouldn't it be more convenient if something breaks down completely to simply disappear?