カフェトリカルカフェ

"Hey, nii-san! Taking a part-time job without telling your little sister? This will not do!"
"Shuu-kun! Me, your childhood friend, is here to help!"
"Darling, here am I."
Just as he gets excited about his café life, three girls show up.

His blood-related little sister, Kiritani Aoi
A childhood friend he's never seen in 5 years, Tachibana Mia
and, out of nowhere, a pretty girl calling him "darling", Shiina Serika

"I am the one and only sister of nii-san! I'll never let anyone take him away from me!"
"Noooo! Shuu-kun's first kiss will be mine!"
"I'm his legal wife. None of your efforts will ever be useful."
"Shuusuke? Popular, aren't ya? Don't you remember I'm the first girl to reach out to you?"

Love rivalry of girls with over 200% affection in a cafe known as "Arte"!
Who will be the one to win over him?!

The race has now begun!

(translated from https://madosoft.net/cafetrical/story.html)