Ogino Yuzu

[“Did you forget my breasts? ^^;” is the level that provokes you... twin sisters with extremely small breasts (flat sisters)/older sister]

Second year student at "Saint Boinpurin Academy".
Twin sisters with extremely small breasts are so famous that no one in the school knows about them.
These poor girls are teased with the fact that they don't have breasts ever since they entered school, and are nicknamed the Flat Sisters.
However,
Pettanko-chan makes her worry even more about whether their breasts have actually been gouged out.
She is the older of her sisters and is a lively girl who hates standing still.
Her joy, anger, and sorrow are expressed honestly.
She
transforms into an aggressive type who takes a stance of fierce resistance against people she recognizes as the enemy.
For those who don't like it, she'll give you a punch, no questions asked.

"I'm used to being provoked now!"

From https://gyutto.com/i/item115308?select_uaflag=1