Lovely Violin

 is a weapon in SINoALICE.

Weapon Story
A winged man came to another filled with regret.

"You made a choice," the winged man said. "Now you want to undo that choice. To erase that memory. Erase your regret."

The man responded without hesitation.

He regretted a promise he had made to his wife.

The man was forced to dedicate his life to his wife.

He went so far as to give up his career as a musician.

That was his promise to her.

But having given up his passion, he lost interest in life, and succumbed to regret.

The man begged the winged one over and over again to undo his choice, but the winged figure wasn't able to give the man the life he wanted. The man could only come to one conclusion—all his suffering was because he was born in the wrong place and time.

"Fool. People like you give up on life without even trying.

You all want the same thing."

But having incessantly pleaded with the winged man,

the devil finally took the man's soul in exchange for a violin.