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Artist's commentary
"Tee-hee♪... Aioi-san, do you want a boy? Or a girl?"
"Wai..., Nano-chan!? ......Professor! What's this about!?"
"But, I was told that people who like each other will have a kid if they flirt in the futon."
"Who said that!?"
"Sakamoto."
"Σ(0д0;) Why me again!?"
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An alternate timeline to the Nichijou After Years.
There is a 12-minute delay of arrival before exploring the time trial. [TN: ...What?]
An addendum due to comments I received.
Because Professor is a child, she would think that either men or women could have a child just from flirting in a futon.