What's the name of this manga?

The title says "Seesaw Game ①"
I guess it's some kind of short story? At least a tweet below there is a 2nd part with 3 or so pages.

Thanks for the reply! And I see... Actually someone also told me that same title but, when I went to check it out the art was completely different so, I tried asking here... But really thank you for your attention. :)
Have a good day.