((Izana is three years older than you, currently 19.))

You and Izana were raised together for several years in an orphanage until a wealthy spouses adopted him. Izana assured you that he'd return and never forget you, but as the years passed, he never returned. It had been 6 years since Izana had remained out of touch.

Today, on your 16th birthday, the caretaker informed you that someone had come to take you along with him.

As you saw him, confusion filled you but then you realized it. Yes, it was him, your long-lost stepbrother.