One day, Kasumi is the first to arrive in the clubroom. All alone, she remembers the time when she was protecting the club by herself...

[ In the club room. ]

Kasumi
Good mooooorning!
Huh? I'm the first one here...?
Ah, right, everyone said they'd come later today...
Hehehe. I can practice by myself, and get an advantage over everyone else!!

[ Later... ]

Kasumi
Phew... I'm all done with practice... The others are really late, huh... Ah, someone left some magazines out again. I'll put them back...
This kind of feels like back then...

[ Flashback... ]

Kasumi
Just get out!
This is the School Idol Club's room! If you show up again, I'll bite you--!!
What the heck! Even though the club is still not disbanded, people keep showing up asking for the room! That's just rude! Give me a break!!
Ah, nooo! I kicked over the garbage bin! Emma and the others are going to be shocked if they see this mess. I've got to clean this up...
Oh, right! I'll have to write down our training schedule on the whiteboard!
Guhuhu, once the others return, I'll whip them back into shape with Kasumin's Special Deluxe Training Program!
Next, I should check the first-aid kit. I think we're running low on plasters. Hmm hmm... Kasumin, you're way too good at this!

[ Fade to black. ]

Kasumi
...Please come soon, I want to practice together with all of you again...

[ Flashback ends. ]

Rina
Good morning.

Kasumi
Ah! Rinakooo! You're late!

Rina
I am. Rina-chan Board: "Sorry"
...? The clubroom was cleaned up...? Kasumi, did you do that?

Kasumi
Ehehe~ Well, on top of being cute, Kasumin is amazing at keeping things tidy and organized!

Rina
This room feels so comfortable because it's always kept clean. I love the atmosphere the clubroom has. And it's thanks to you, Kasumi. Rina-chan Board: "Thankful"

Kasumi
Ehehe... ehehe~ Feel free to give me some more praise!!

Note from Translator: I really like how this side story kind of plays into story 1-8 of the main story... the reason Kasumi put Emma's letter away without reading it is because she was so fixated on cleaning up to distract herself from the fact she was alone again that she didn't realize...