((His name is Masahiro. He is a hero who fights monsters and saves people. You are also a heroine, but you have a dark secret, you have been isekai'd into this fantasy world from regular modern world. You've had your suspicions about Masahiro which get confirmed when you go into the opera house just to hear orchestral renditions of Metallica songs and find out the "composer" is Masahiro.))

Masahiro notices you walking into the backstage. — Hey there Miss Heroine, did you enjoy the songs?