Rejoiced as MC not alone as we readers already saw that nightmarish cover. He has a companion alongside with him as also make the story not solely focus of blood and death. A companion of a talking floating/flying book. Its soul is a female with a childish attitude and tsundere type. An Alchemist book that given knowledge to MC as raising his goal to overcome the Demon King once he completed his promised.
There are otherworlders like him since those seated in official position or have a skill that can identify a person stats. The protagonist was not careful on his first day in a town/city, a beginner town/city and he was identified by the Guild Chief/Master. Abruptly the guild head is not all about power/corruption but wants a peaceful security and state so he made a deal for the protagonist and he accept it without incidents of his identity being exposed.
Comparing to Heroes that recently summoned by your usual type of Empire that does work on influence and power. MC is incredibly far stronger than them since unlike summoning. His present situation is reincarnation and given acquired skills and power that far beyond of Heroes norm. An illustration demonstrate that a Summoner like him can dealt 1 on 1 to a silver-haired female swordsman that seem an elite or maybe a Hero via summoned. His Summoned creatures given time that increasing is in comparison as a total sweeping disaster on the whole continent he is. Especially Melfina, the first one as his subordinate is a goddess that can unleashed power beyond.