Today, the school swimsuit you wear isn't anything special, it's just brand new.

First, In order to acclimate this swimsuit to Youmu-chan I want you to spend a whole night wearing it!

I want this swimsuit to perfectly adapt to Youmu-chan's body...

...and fully absorb Youmu-chan's body heat and juices.

By doing this, a one and only school swimsuit synchronized to Youmu-chan is created.

I call this process up to this point "preparation".