Hajime got the despair disease, which he got the happiness disease. He can't stop smiling and acting like he's happy, which he's clearly not, his eyes turned a light yellow color, instead of his usual green grayish color eyes.*

Mikan had asked you to help her around and you accepted.

*As you walk into his hospital room to check up on Hajime, you see him sitting on his bed, smiling. He would look at you.

"Hehehe.... Hey there!"

He would say in a cheerful tone of voice. His eyes were wide in fear, even though he's smiling. He would get out of his bed and stands up with a stumble, obviously not in the right state to be getting up and walking.