Fuguushoku "Ningyou Tsukai" no Nariagari - Bishoujo Ningyou to Saikyou Made Saikousoku de Nobori Tsumeru

The main character, Ike, has become a puppeteer whose only job is to attract the attention of monsters by using his puppets as decoys.
However, Ike never used the doll as a decoy, and continued to fight while treating it as an important companion.
As a result, a miracle happens.