The exit for water has to be at the lowest point.

Which is why...

...I ask you to dive to the deepest part of the library and open this book ♡

Eh!?

Well, you're already wearing a swimsuit for some reason ♪

What is this?

Why would you possibly be wearing a swimsuit?

Besides, I'm not the only one in a swimsuit—

...That's true. Fine...

...Wait!

Why are you already relaxing and reading a book!?

Mm?

Because you're here...

...I guess?

...Ngeh!?