Transmigration Leads to Troubles Which I Obligated to Solve, Damn it!

Kazuma Satou, a 16 years old broken-hearted young man that turned into a shut-in NEET, wasting all of the available potentials. Kazuma, a proud Crimson Demon who likes to use weapon instead of magic, getting his progress stagnant by his pride. Other than having the same forename, there wasn't supposed to be a single.relation between them. Until one day, a mad goddess emerged. "FU-"