AKA Tsuihô Sareta Tensei Jûkishi wa Gêmu Chishiki de Musô Suru
Elymas awakens the "flawed" Heavy Knight class and is disowned. Realizing this world mirrors a VR game he mastered, he uses this secret knowledge to prove the "weakest" class is strongest.
Note: This show is in Japanese Language with hardcoded English Subtitles.