This game is easy, IF you already grind for like 1.5-2 hours, i make it straight fight on 3 days after the grind, my stat is focused on str, agi and def (you can train those stat from the "knuckle's place" after fighting him), then when fight with MC u need to use "Focus" or "Counterattack" (Spiritual Arts) make sure u have those skill by raising the level from match-up with trainer or knuckle's/jack, then im only use "Thunder Heel Kick" from Martial Arts (STR-dependent damage), only got 2/3 hits from her before win in the last stage (she's so OP, but i got 0 damage and 0 death because of my stat xD).
I Hate NTR, so i grind!
funfact: you cannot avoid NTR, but you can decrease it, i only got 1 NTR scene, the kiss with junior, that it.