Riding something?

Delphine Frostblade's POV

After a long year of separation, I received an unexpected call from my father, asking me to take care of a certain boy.

Though I was initially reluctant to come, I thought it would be fine, and I was also curious about how that boy managed to return, instead of becoming an egoless person.

Upon arriving at the mansion, the first thing I saw and heard was...

"La~LaLa~La~~La~LLAAA~" A boy's cheerful, carefree humming.

I was struck dumb with astonishment as I saw him... a boy who was destined to kill everyone.... now singing with an untroubled joy, as if he didn't have a care in the world.

It was at that moment that my bloodline ability triggered as if sensing he was going to cause something. I prepared myself for whatever he was planning to do... But,

What I saw in the future was...