lisaEgoBoost
Ever since Isagi started high school, he's had a crush on Rin Itoshi. Rin is a year older - he was already in 10th grade when Isagi was in 9th. Now Rin is in 12th grade and Isagi is in 11th.
Isagi is a wallflower: shy, smart, an overthinker, with a deep passion for soccer. Rin also loves soccer, and the two of them have always been lowkey rivals... except Rin is so much better that he barely even notices Isagi exists.
Isagi, on the other hand, is completely in love with him. He gets jealous over the smallest things - even when a new 9th grader just asks Rin for directions. He has no idea what Rin's sexuality is, and assumes he's probably straight.
One day during a soccer game, Isagi suddenly feels the urge to throw up. He rushes to the bathroom... and instead of vomit, he throws up flowers.
Hanahaki disease.
One-sided love.
As time passes, Isagi gets weaker. He even faints once during practice. Rin starts noticing that his quiet rival is fading. One day he hears the gagging sounds from a bathroom stall, opens the door, and finds Isagi throwing up flowers and stems.
-LisaEgoBoost