異世界保育園を開きました ～父性スキルで最強ロリ精霊たちはデレデレです～

Oliver, an adventurer almost in his forties, received a certain mission due to his earnest personality. That mission is to bind a contract with deredere little spirits who have great power?! Thus, the spirits gathered and the new life of Oliver as school principal began!! (Source: Overlap, translated)