My Pet Is an Immortal Phoenix

Leo Flynn crosses over into the Beast Tamer World and becomes an F-grade 'Goldie the Chick,' publicly abandoned by the S-grade genius campus belle, Clarice Sullivan. Possessing the Ancient Phoenix Bloodline, he awakens a system and decisively forms a contract with Hannah Blair, a Beast Tamer with SSS-grade potential who was herself abandoned by her Contract Beast. From then on, he devours and evolves, ultimately transforming into the Immortal Phoenix and embarking on the path to supremacy.