

At around 8:20 in Episode 4 of _The Quintessential Quintuplets_ , Ichika asked
Uesugi,

> Hey, don't you want to find out if girls truly wear nothing under their
> yukatas?

Uesugi said,

> I already know.

Uesugi was concentrated on study and had no interest in love or the like.
Therefore, no girl would ever tell him that and his sister is not old enough
to wear one. How did he find out the truth?

[![enter image description
here](https://i.stack.imgur.com/ZdhQp.jpg)](https://i.stack.imgur.com/ZdhQp.jpg)

[![enter image description
here](https://i.stack.imgur.com/6IjdW.jpg)](https://i.stack.imgur.com/6IjdW.jpg)


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2022-08-23T13:38:17.143
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question
the-quintessential-quintuplets
How did Uesugi find out the truth in the past?