Prologue: End of a Tour and a Last Will

(Y/N)=Your Name
(L/N)=Last Name

Richest CEO and only Heir by Day, Famous DJ by Night! This is the life of (Y/N) (L/N)! He has eveything he wants yet he feels lacking. Something was missing in his life.

One night after completing his European tour, an attourney came to meet him about his late grandfather's last will.

"Upon my death, I declare my only grandson to be engaged to the eldest granddaughter of my old friend, Toyama Eisuke!

P.S.
My grandson can have as many wives as he wants just as long as he marries my friend's granddaughter first."

With the crazy last will in effect, (Y/N) whole world will change!