Kuro no Shoukanshi

Kelvin gives up some memories from his former life in exchange for strong abilities, more skill points, and the title of S-class summoner in order to get ready for reincarnation in a different universe. As an added benefit, the goddess Melfina, who is assisting his rebirth, gives him the option of choosing any companion to help him in his summoner job. Quickly deciding on the deity, Kelvin—who had fallen madly in love with Melfina at first sight—is sure that his intense feelings for her will return even in the absence of all of his memories. Melfina serves as Kelvin's guide as he sets out on his fascinating new expedition. However, he needs to gain a large number of mana points in order to call his beloved goddess in physical form. The best method to do this is to level up by engaging in battle with challenging foes and forging alliances with more challenging allies.