Mitsudomoe (meaning Three-Way Struggle) is a manga series created by Norio Sakurai. It was later adapted into an anime with two seasons. The second is titled Mitsudomoe Zōryōchū!, but it was cut short. Satoshi Yabe begins his job as an elementary school teacher, but he is assigned to the class with the Marui triplets. Mitsuba, Futaba, and Hitoha are the most troublesome students at school. The series follows the lives of them and the other students.

Manga

170

226

Anime

Season 1 Opening

We're gonna be xxxxxxx (S01E10)

Things get weird in 5 seconds (S01E11)

After Futaba squeezes Hitoha's cheeks, imagining they're C-cup breasts, she then begins to squeeze Mitsuba's flab, before declaring her stomach an I-cup.

It's... It's... G, H, no...
I-cups!
Die!!

Later in the episode, Mitsuba is shown a vibrating ab belt advertisement. After finding an abandoned phone, she attempts to use it as one.

That's not cheap at all! I don't want that!
Yes I do...
My abs, they're getting tighter!
I'll, use dad's phone when I get home...

Later still, Mitsuba has stolen Yabecchi's phone. As it vibrates, Mitsuba discovers that it's moved to her back. Sugisaki suspects her, and attempts to get the phone. Futaba uses this oppurtunity to squeeze her stomach again though. After passing out in euphoria, other curious classmates follow suite.

I left my phone on my desk, it was right here!
Try calling it
It's on my back!
You're hiding it somewhere! Give it back!
I'll help...
Body exam, body exam...
Hey!
So soft...
Futaba got KO'ed. She's euphoric! She got hit with some kind of super-erotic attack!
Very well! Hit me with your best shot, Eldest!
Nooo!
What'd you do to them?!
I want to feel your technique too!
Not in a million years!
But I wanna end up like that too... all... satisfied...
I want you to satisfy me too!
You perverted whack-job!