Yuna, who has lived without being attached to anyone, one day gets into an accident while rescuing a stray cat she was caring for. That cat was none other than an angel?! She gives Yuna, who saved her, a contract that will allow her to start her life anew in another world, and Yuna signs it... but the place she arrives is a faraway kingdom similar to Korea but with a completely different system. Moreover, not only did he work for the same black company as in the previous world, but the apartment in Yuna's name, which he received as a reward from an angel, had a huge loan on it! Yuna realizes that Cat Angel has given her a fraudulent contract and she wants to find him and return to her original world...?