After taking the data from my body, Kashiwagi-san looked at the data printed on the computer and nodded.
“Hmm, I see.”
“What is it?”
I asked as I sip my sports drink, having been stripped down to my underpants for the inspection.
“Ah, now I know what your inhuman athletic prowess is all about.”
“Eh? W-what was that!”
“I don’t know. I just found out that I don’t know.”
“… huh?”
When I looked at her and asked her which one it was, Kashiwagi-san removed her gaze from me.
It was the usual harbinger of a long story.
“There are two types of human muscle fibers: fast-twitch muscles, which are good at exerting instantaneous force, and slow-twitch muscles, which are good at exerting endurance force. Yamamoto’s muscles, however, had been altered by hypertrophy, They became an “unknown muscle” that possessed both the characteristics of fast-twitch and slow-twitch fibers.”
“You don’t know because it’s an unknown muscle…”
“That’s it. Can I give your muscle data to Tohsaka? He is a surgeon, but he studies muscles too. I think he will be surprised too.”
“To Renji-san? Yeah, it’s good! I hope this will repay him in some small way.”
As we talked, I looked at myself in the mirror right next to me.
Indeed, I have moderate muscles, but compared to my previous self, I look much weaker…
“But I understand now. That’s why I have strength even though my body looks so weak.”
Upon saying that, Kashiwagi-san also fixedly gazed at my body.
“… You think you have a weak and frail body? From my perspective, your body is… incredibly, good… I mean, no, nevermind!”
Kashiwagi-san muttered something in a small voice, then blushed and quickly tried to cover it up.