You can watch this scene with in the Japanese dub with English subs here---- X
or the English dub with English subs here---- X
The scene is fully voiced^^
(This scene happens around 30:00 in the Japanese dub and around 23:00 in the English dub)
It does NOT contain many spoilers for the plot, it's mostly filler.
I just loved this scene SO much I had to fic it.
(Author's note; Mishima's name is Yuuki, I refer to him as so. I also use the name "Akira" for the protagonist as he is so named in the manga.)
After everyone had agreed on where they were sleeping, they turned off the lights and settled down for bed. Yuuki was lucky enough to get to sleep in the bed. But he found even in the comfortable bed, he couldn't fall asleep.
It didn't help that Ryuji and Ann were talking up a storm, but the main thing keeping him awake was his stomach. He had been feeling a bit queasy earlier but playing cards had been enough of a distraction to help him forget until now.
Tossing and turning in bed, Yuuki could feel the queasiness progressing to something much worse. He didn't understand what could be making his stomach hurt. He didn't think he had eaten anything that was particularly out of the ordinary for him or that tasted off. But it had to be something because the feeling that had started out being almost unnoticeable, progressed into something far worse in a matter of minutes.
Although desperately trying to fall asleep, he soon found himself with no choice but to give his stomach the attention it was demanding. Yuuki stumbled out of bed and went into the restroom. He was ever so slightly relieved to be in the sanctuary of the bathroom but it still made him nervous to be within earshot of everyone.
He stood around nervously, then started pacing back and forth in the small quarters of the room. A pain went through his stomach that forced him to double over. It took all of his willpower not to cry out right then. He leaned over the sink, clutching his stomach and shaking.
He saw in the mirror that he was sweating and he waited on bated breath for the pain to subside. When it finally did, he leaned against the wall, enjoying the relief as much as he could for fear that it wouldn't last.
The next time however, he wasn't hit with pain but intense nausea. He bent forward, closing his eyes and breathing through his nose. He slid down the wall until he was sitting on the floor with his arms wrapped around his legs. He buried his face in his knees, begging for the feeling to go away. By then, he knew it was out of his hands. While curled up against the wall, his body started fighting him.
Yuuki could feel his stomach lurching, trying hard to push whatever was inside of it, out. When an air bubble forced its way up his throat with a muscle spasm, Yuuki knew he had no say left in the matter. He darted to the toilet and hung over it, clutching his stomach tightly. The nausea was overwhelming and he couldn't focus on anything else.
He gagged inside his throat and started to whimper. He suddenly felt scared and alone. He cried out.
"S-someone..." There was no reply. "M-my stomach..."
Then his entire body lurched forward. "Hrgh...!" He vomited into the toilet with a loud heave.
He could hear Ann and Ryuji outside. "That didn't sound good..." Ann sounded concerned.
Yuuki couldn't hear any more of their commentary as he continued to puke up his stomach contents into the bowl. When he found a moment to breathe, he flushed the toilet. Gagging again just as the water was settling. Gagging brought more hot liquid up his throat and with another heave, he spewed more digested semi-liquids into the newly clear water. These bouts kept on going for what felt like ages.
In the meantime, Ryuji, Ann and Akira were laying in the other room listening to every one of his episodes.
"Man... he's really hacking his guts out in there." Ryuji crossed his arms. "I feel bad for the guy."
"Maybe... we should call for help?" Ann said nervously. "What if he's really sick?"
"The last thing he probably wants is to be fussed over by a bunch of adults right now." Ryuji thought. "I think we should leave him be awhile. What'd you think Akira?"
Akira nodded from on the couch.
“Okay..." Ann said hesitantly.
As they were discussing it, they heard Yuuki vomit loudly from inside the bathroom again. The sound of splashing echoed against the walls inside. "I don't think I'll be able to sleep with that though..." Ann sat in bed with her legs over the side of her bed.
Yuuki heaved loudly again with a moan and Akira sat up too, resting his chin in his hand. Ryuji sighed. "Looks like it's ganna be a long night for all of us."
By about 2:00AM, the three of them had just about exhausted all of their topics of conversation, when they noticed that it had been quiet for some time. "Maybe we ought to check on him...?" Ann thought.
"Mm... pass..." Ryuji mumbled. "Akira?"
Akira's shoulders dropped and he reluctantly agreed to. He got up and with a knock, peered into the bathroom.
"Akira...?" Yuuki opened his eyes slightly. He had been using the toilet seat as a pillow and Akira felt pretty sorry for him. He was drenched in sweat and his eyes were red with dark circles under them.
He asked casually if Yuuki wanted some water. Yuuki seemed to perk up ever so slightly, lifting his head up. "Really...? Thanks Akira." He said in a hoarse voice.
Akira nodded and went to fetch him a water bottle. Yuuki drank it gratefully and sat back against the wall. Akira leaned against the sink nonchalantly, hoping to escape as quickly as possible. "I don't know what came over me but it was killer." Yuuki sighed.
Akira told him Ryuji thought it might have been the tap water.
"Heh? No way!" Yuuki cried in a squeaky voice. "Hawaii's part of America! We're not in some underdeveloped country. I'm sure it was just something I ate."
Akira shrugged and Yuuki found himself smiling slightly. "Hah, tap water. That's a good one Sakamoto."
Akira scratched his head awkwardly. He told Yuuki if he was feeling better, he should try to get some sleep.
"Yeah.. you're right." Yuuki nodded. "Thanks for checking on me Akira. You're a real friend."