I guess with the appraisal skill in mind, dude's gonna venture out (after finishing his training to be "competent" enough to survive) and find people who are strong and form a party.
Or increasing his appraisal skill would detect weak points that allows the MC to take advantage of that,
Man, I really like both but this is really the pain in harems when polygamy is illegal or unwanted for.
I'm all in for Fuyuki X Shiki, but if Sayurin X Shiki manages, i'll support it.... *sobs*