MTL - Doctor’s Life Simulator - ~ ！

To treat her sick brother, she was forced to marry him in place of her cousin, who was disfigured and paralyzed. At first, their relationship was purely transactional, with neither caring much for the other. But after going through a lot together, they fell in love with each other. He doted on her deeply.She was considered an ordinary person by the world, but it was later discovered that she had multiple identities - a mysterious underground boxing champion, a highly-skilled doctor, and a mysterious and renowned composer... He also realized that their fates had been intertwined long before they met.

Kain, a young teenager, accidentally lost in a Dungeon and awakened a special system. A system that allows him to continuously return to level 0, using his level to add and increase his skill points. From there, Kain began his journey to find the truth of this world, and when he took off that mask, what he saw was...

– The planet [Earth] has entered the abnormal state [Apocalypse].

Nidel, who belonged to the Technological Magic Order that held low prestige, became the bodyguard of a foreign prince behind the scenes. Left with no choice, he assumed the role of a bodyguard, turning into a black cat using the transformation magic he prided himself in, but the one who assumed the role as official bodyguard was the Royal Knight Legato. Nidel, who one-sidedly held feelings of affection towards Legato, thought of this circumstance to be interesting, butー