The main reason he keeps fighting was to protect his sister sw made that for him after he exposed her bullies that's why he works at sw he is capable of helping people something he cannot ignore hence why he keeps fighting and getting involved
For people saying this was rushed not everything needs 10 volumes considering the way mamiya was the end makes sense and I love tragedies While he kept making is research I felt sad bc he wasn't sharing time with asada in his last moments
Since this came out I been holding reading it just from reading the comments I am crying