100-NIN NO EIYUU O SODATETA SAIKYOU YOGENSHA WA, BOUKENSHA NI NATTE MO SEKAIJUU NO DESHI KARA SHITAWARETE MASU (MANGA) - RAW

Eisen is a great master that trained 100 very strong heroes that after various battles lead th world to a period of peace.After seeing all the letters his disciples sent to him he decide to travel around the world with his elf assistant (or at least I think she is an assistant) but without warn his disciple so that he can travel without problems and have a nice tour of the world looking for the places hinted by his disciples in their letters.