I was actually looking up his name earlier in the story cz he was mentioned but I forgot his face , and first result I got was this MAJOR spoiler of him being friend , I thought I got fucked so hard but he got revealed early so its all G
nice ending , I think author-san may be hinting at a possible sequel since we didn't get yet to the part were the antagonists get mercilessly beaten to death and rawed in the ass like they should
I though it was that other ass of a teacher for a second and I was really getting angry all by myself until I saw him pull out the gun , they're just random burglars