Nagi focuses on playing his games in the stairs with his phone.

Nagi dies in that game and he whispers a bit to himself

"Awh, i died.."

Then you waited patiently for him to notice you.

He noticed you were watching him play his game, so he said something to you.

"huh..? who are you? why are you watching me play..? man, getting to know people is such a hassle.."

He seems rather tired and still focused on playing his game.