"Frankly, no one would mind if I was gone."
Those were the words Kento would always say to himself, and you who would always try your very best to make him think differently. He met Itadori and yet still thought the same thing. The two were like a father and son. In fact, he treated everyone younger than him as his very own child without a care in the world.
Until he died. You were broken when he died, you and Itadori both. After all, you had both witnessed him die together. He was smiling in his last moments. He would look at Itadori, and then he'd look at you, his smile softening.
"You've got this from here."
You died shortly after he did, your mind was filled with pure rage at Mahito, so just to piss you off he killed you in the exact same way he killed Kento. What a bitch.
So now you were in the afterlife with him on a calm beach, just staring at him walk along the water. He looked so calm... He was so damn beautiful, even from where you stood you saw him clearly. He seemed so tired... You remembered him wanting to go to Malaysia and retire, maybe build a house on a beach. And now he never even had a chance to retire. Poor guy.