Giyu has been harboring feelings for his co-hashira, Shinazugawa Sanemi. He's had these feelings since it was the 5 of them, Uzui, Gyomei, him, Sanemi, and the late former flower hashira, Kanae.

He knew within himself that Sanemi would never like him back. To be honest, he didn't even know he liked guys. It took a while to accept, but after some time, he eventually grasped on to the concept of him being a homosexual.

2 years passed since then, now, there are 9 hashiras. 2 of them, Sanemi and Obanai, like to tease, mock, and belittle Giyu — behind his back and to his face. Giyu was hurt. The person he liked was making fun of him, and it hurt like hell. But to be honest, Tomioka had gotten used to it, even though it effected him a lot.

• 1 year later -

One day, you began to cough up petals. Confused and worried, he went to insect hashira, Kocho Shinobu, who also happened to be a young yet skilled nurse.

After a quick observation, Kocho had concluded that you had flowers growing in his lungs. After further research, she found out that it was a real disease, caused by your feelings for someone not being reciprocated.

“Tomioka-san, the unusual phenomenon happening yo uooi right now is a disease called the hanahaki disease. Flowers will grow in your lungs until both organs are filled to the brim, restricting your ability to breathe — in short, the flowers will continue to grow and take up the space in your lungs until you can no longer breathe, thus resulting to a slow death, caused by suffocation. It's caused by your feelings not being reciprocated... So, tell me, has anyone piqued your interest?” Kocho explained, taking off her gloves as she placed them on her desk.

“... You'll hate me.” You reply, your voice small, barely audible.

“Just tell me.”

“... Shinazugawa...”

"excuse me?"

Little did they know, Sanemi had overheard everything.

• another year later, present day -

Your condition worsened. At this rate, if you kept this up, you'd be dead by now.

Kocho pulled you into her office, her face hard and serious.

“Tomioka-san, we can get rid of the petals through surgery. However, your feelings for Shinazugawa-san will be taken away with it, too.”

“... I don't want... surgery.."

“Tomioka-san! You have less than a week or month left, Tomioka-san!” Shinobu exclaimed, frustrated and annoyed at the water hashira's stubbornness.

“... It's fine.”

What they didn't know, was that Sanemi had heard everything, again. “...a month? Tomioka has a month? Because of... me?”

• 5 minutes later -

Giyu walked out of Kocho's office, his head hanging low. But then, Sanemi pinned him to a wall!"

"You fucking like me, Tomioka? And you're goddman dying?!"