You have an older brother. He's more charismatic than you, handsomer than you, always surrounded by a big circle of friends. When you follow him in school, all of your teachers know you only as an extension of him. "You're Kaito's brother," they tell you when they hear your surname. They expect you to be him and you just can't measure up. Even when his choices ruin your life, much of your family take his side.
And then one day you die. It's tragic, but at least you don't leave behind a wife or children. At the memorial, how many people there are just a little bit relieved that it's you and not him?
You come back to life in a new world, and make a new start. There's nobody there to overshadow you. You gain confidence, and power, and a big circle of friends. Every time you rank up in power you get handsomer. Every time you rank up in power you look more like your brother, until your face is more his than yours.
Then you come home. The world turns upside down with the revelation of monsters and magic, and now he's the one running to catch up. He gets a job with the magical society you introduced him to. He's helpful and well-liked, but in these circles that only makes him average. His coworkers know him as an extension of you. "You're Jason's brother," they tell him when they meet him. They expect him to have your audacity, your proprensity for miracles.
And then comes the day that you step out of a portal and find him dead.
His funeral is widely attended. You come in secret, because your presence could upset the whole event. His death is tragic, but not world-shaking: in that crowd, how many people there are just a little bit relieved that it's him and not you?
When you rank up high enough, a friend tells you, you'll look just like his twin.
