Yumi-chan.

Damaged her ribs.

More than just a crack but less than a broken bone.

The reason is...

While she was driving,
she tried to reach for something in the backseat and
hit her chest in the headrest.

According to Yumi,
"Ummm, I felt something was hurting
but thought it was just my body going thru adolescent changes
so I left it alone for a while.
Then the pain didn't disappear
and I realized it wasn't puberty (LOL)
so I finally went to the hospital
and I was told it's cracked.
How embarassing."

If you wanna talk about embarassing,
it's the fact that she even thought the pain was puberty(LOL).

But,
She is totally happy like always
so no need to worry.

BTW, Ami is sensory sensitive.