14 Juicy - Vol. 2 Ch. 28 - Club Activity 28

[MangaDex]

 

[Pixi97]

Mushroooom!
Btw, I never saw this type of gymnastic equipment, so I had to search for it. And holy cow, there are a lot of type of "mushroom".

 

[subliminal]

How many animal costumes does Mana have?

Looking it up it seems to be known as either a dome or mushroom type pommel horse.