Mizugaki Tsukasa♂

After failing his college entrance exams due to medical problems, he eventually gets a job through his father on Terminal Service One, although he initially does not know what they do. He is assigned as Isla's spotter and soon becomes attached to her, unaware that she is at the end of her lifespan. When he finally finds out, he refuses to abandon Isla and continues to be her partner. He has developed feelings for Isla ever since their first encounter, but only realizes it during their partnership.

[From Wikipedia]