Suitei Nenrei 120-sai, Kao mo Shiranai Kon'yakusha ga Jitsu wa Chouzetsu Bikei deshita

There were five princesses in the Kingdom of Ix.

The first princess was the Warrior Princess. If she could wield a sword, no ordinary man could match her.

The second princess was a songstress. It is said that her voice is superior to that of the Sirens.

The third princess is a beauty. She has been with a prince, a knight commander, and has had countless affairs.

The fourth princess is Princess Kanade. Piano and violin, she plays heavenly music.

The fifth princess is - well, I don't know.

The youngest princess, Mabel, had nothing to compare with her superior sisters.

One day, she is betrothed (of her own accord) to a "masked magician" who is estimated to be over 120 years old.

I've never even been in love yet!

Mabel went to the school to have the engagement annulled, but there she found not an old man, but also an extremely good-looking man!

However, because of his too good-looking face, she is said to "fall in love" with him when she sees his true face, but for some reason, it has no effect at all on Mabel. ......?

At first Mabel is disliked by him, but he eventually falls in love with her because of her earnestness and dedication.