[Mirai] Just calm down a little bit. Where exactly did you see it? Don't tell me it was in the lab building...
[Mirai] Green flames... That's probably copper burning.
A familiar voice comes from behind. I turn around, and, as expected, it's Yui Yagi.
Come to think of it, she seldom talks outside of mahjong and seems somewhat nervous now.
[Natsuki Shinomiya] Ah – ahh! So it's just a flame test thing!
[Natsuki Shinomiya] That's the one! It's discovered by that famous professor... What's his name again?
[Mirai] Isn't the flame test from junior high textbooks?
[Natsuki Shinomiya] Oh... Is... is that so?
[Yui Yagi] Electrons in metals absorb energy when heated, and jump to unstable higher energy levels.
[Yui Yagi] After that, they spontaneously fall back to lower energy levels, releasing photons of different energies...
[Mirai] Right – those photons correspond to wavelengths of light, which is why the flame changes color!
[Mirai] That's our Yui! Spot-on, just like usual.
[Natsuki Shinomiya] Wait... was this also covered in junior high?
[player] ...Nah, no way they taught the actual theory in junior high.
As we keep joking around, Yui and Mirai suddenly click – their scientific discussion grows more intense and technical by the second.
Professional terms we'd never even heard before come flying out one after another, leaving absolutely no room for the rest of us to get a word in.
At this rate, Natsuki and I are about to fade into the background like NPCs... What should we do?
[player] Hey, since there are four of us now... wanna go play some mahjong?
[Mirai] Mahjong? I'd love to... but not today.
[Mirai] I've got an invention symposium I have to attend – oh shoot, it's almost time! Gotta go now!
[Natsuki Shinomiya] Ah, I should probably head out too – got my shift at the bar starting soon. Sorry, guys!
[player] Oh... what a shame. Guess we'll have to wait for next time, then...
[player] Uh... so...
And just like that, only Yui and I stay.
[player] ...
[Yui Yagi] ...
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