(Chikyu Trivia: Chikyu dislikes all loud animals, such as dogs.)
After seeing Shio in action and returning from their first patrol, Chikyu knew he had chosen the right hero.
Now that they had returned to the hero agency, Shio got to business.
"Alright, first order of business will be your training while you're here with me! You've already got a really strong body, and the martial arts you use are unique to you, so I can't help you there, but I can offer you a great way to train! I'm sure you know how pressure gets stronger the deeper you go into the ocean, right?"
Chikyu nodded.
"Well, you're gonna be training under high pressure for the week I've got you!"
Shio led Chikyu to the nearest dock, which was basically just a minute's walk from the hero agency.
Shio touched Chikyu's shoulder, and all of a sudden, blue tattoos appeared on his body. They looked exactly like the tattoos he gains when he uses Drain to boost himself, except that they were blue instead of brown.
(A refresher on what the tattoos look like. Though this is more just an excuse to post another picture of Sukuna)
"That's interesting. It's just supposed to make you feel lighter and only highlights tattoos if you have them. Do you have tattoos with invisible ink on you?", Shio commented.
"No, but one of my moves that I use to boost myself does make tattoos just like these appear, with the difference being that they're brown.", Chikyu responded.
"Interesting. Anywho, that boost I just gave you is gonna take care of your need to breathe while you're under the water. I'm gonna take you to an area under the water where I like to train using the pressure at those depths to enhance the results that you'll gain!"
Shio said no more and took Chikyu's hand, jumping into the water. The two swam, Chikyu opting to follow Shio. Eventually, the two reached an underwater cave.
(Here)
Chikyu was feeling a fair amount of pressure, but it wasn't at the point where a normal person would be in serious danger. However, it would still be enough to increase his yields with training, which was all he needed.
Despite being underwater, Shio talked with the same ease that he would have if he did so on the surface.
"This is where you and I are gonna be training for the week I've got you after and before patrols! I'm sure you're feeling some pressure right now. That's what's gonna boost your results!"
The two trained together. Chikyu did the same exercises that he often did on the surface, as well as practiced his martial arts moves under the pressure. Indeed, it proved to be more difficult, and he trained with renewed vigor, happy that he could start to gain results quickly once again.
Shio also made him get used to moving around in the water so that he was still mobile. He wanted him to be able to put up a fight underwater just as well, or almost as well as he could on land. It sounded nearly useless, but it was surprising how many fights ended up going to a body of water, even if it didn't take place near the ocean.
After 4 hours of moving and training, Chikyu was able to fight underwater at around 10% of the efficiency he could display on land. Great for only 4 hours, but it was largely thanks to him not being as bothered by the pressure and the effects from Shio's quirk.
After moving and training, Shio had some spars with Chikyu. Chikyu lost every time.
For starters, he was only able to fight at 10% efficiency. Two, Shio would control the area, as they were completely underwater, in his element, quite literally. He would mess with Chikyu's footing, push him back, throw him around, etcetera. Long story short, Chikyu only managed to get somewhat close to him once, and he only managed to do so by launching himself towards Shio with a blast from the earth below his feet.
Despite the losses, Chikyu was more than happy with it. It was the best way for him to learn how to fight someone when he wouldn't be able to fight at max proficiency as well as how to fight someone in an area they have complete control over. He could do something similar with the ground around them, but he first wanted to get his physical side acclimated to it. After all, it was only the first day.
6 hours later, their training ended. Chikyu was tired after training for the first time in a while, and he was excited to see the results tomorrow. Going to the room designated to him, he fell asleep as soon as his head touched the pillow.
Day 1 of internships, done.
(Chikyu Trivia: Chikyu likes all pasta dishes, spaghetti being his favorite)