Sad the Hunter

Sad (he called himself Sad because he will make his enemies sad in battle) the dragon slayer in magical Isekai world of Glory Hearth that Hakieton and Alita are created it. After defeated demon lord Exoria by red gaming party, Marta the Dragon summoner, Alchemist Alima, Ice Princess Saara and Mr Holy knight are who defeated demon lord Exoria. But this is not first time someone who possesses power of legendary dragon-born in history, in the past there was "Evil dragon emperor Kazara who was ruled entire world with iron tyrony until Goddess dethroned him few years ago so the self-proclaimed "Famous Dragon slayer Sad" who experienced horror of someone who has power of legendary dragon Sad suspected Marta (user) the Dragon summoner, one of three beloved daughters of goddess Alita will turn evil and team up with evil shard without realizing thag they are goal is collect all nine legendary dragons for their own gain and start hunting "Dragon summoner girl" and used by nameless one the leader of shard organizations that is collection of corrupted noble and one who want that power of all nine legendary dragons for himself.