When Chat Noir runs into an upset Ladybug due to her civil life, he offers her to use the mask as a getaway from her day to day life – like him. He has no idea what he just unleashed.

Adrien has just moved out on his own, and his attempting to start his own business after the defeat of Hawkmoth revealing to be his own father. He wanted to cut ties with his father's company and show the world that he could start his own. He just never expected to share an apartment with a familiar, blue-eyed girl.

Ladybug had finally defeated Hawkmoth despite losing her teammates. Broken and alone she takes her life only to find she's fourteen again. Now knowing everything that will happen, Marinette won't let her friends die this time around, especially Adrien.