Thanks for the chapter and I've found a small typo in page 7. An extra apostrophe in sentence "...Himari's eyes, we're a little red", the apostrophe in we're is wrong in context, I guess.
Technically you can use TM 31-210 Improvised Munitions Handbook to build the explosive itself in guerilla conditions, which is the hard part for most civilians. You might be able to find similar contraption how-to's for the detonator part on the internet.
I agree on the student body part though.
I know I'm walking into a very obvious trap, but I have to add this correction for my own sake.
It isn't a pigeon, but a parakeet. A small parrot species that can be very articulate. This one is most likely a male that didn't bond with a female parakeet, thanks to its high aptitude of speech...
Inverted Triangle by itself can be a compliment because it represents broad shoulders and tight waistline, hard to acquire with working out; has nothing to do with legs AFAIK. Adding brawny before it insinuates that all he has is his body.
Heat above 40 degrees celcius (104 fahreneit) would be dangerous and possibly lethal for the semen, but we are talking about out of body situation, so the temperature would be around 30 - 35 degrees celcius (86 - 95 fahreneit) at most. Normal temperature for sperm because male genitalia normal...
That basically confirms that FMC still has a crush on MMC. Also his curt attitude towards her in high school might be a way to hide his crush on her; which still exists, now hidden behind a teasing attitude.
Sorry for this unwanted shout out. Drunken ramblings here, feel safe to skip this comment.
I got aroace vibes in this chapter tho. No crushes and interest in romance in high school, hard to find especially in manga. I'm calling it here, Souko-chan has no interest in romance, might be a...