[Feeling those things hits Yukine quite hard. While being in Kiseki is like actually being alive, it's just a small part of his existance. What really awaits him back home is just... being dead, being a Shinki. And even though he has come in terms with it, actually
feeling
what it's like to be alive... It makes him feel envious, but happy to have felt it at the same time. He's just very confused by it.]