Um... what kind of love letter was it?

Hey, read it aloud.

Ehehe, now I'm feeling a little shy.

"To my beloved Yui-senpai."

"Beloved" ... !?

"Happy birthday to you."

"Whenever Yui-senpai embraces me, my heart begins funyafunya time. ☆" funyafunya = to go weak

"Please continue to love me lots from now on, nyan! ☆"

"From, your kitten. ♥"