|Episode 1 - First-time Super Sadist|
This black haired school girl Maika is trying really hard to find a job so that she can afford to study abroad, but she has this uncontrollable sadistic look in her eyes that makes everyone scared of her. Later, she tries putting on glasses to hide her scary eyes. Those glasses don't work, but some guy who randomly bumps into her instantly falls in love with her despite her scary eyes... and that guy happens to be the manager of Cafe Stile.
This cafe has a weird gimmick where each staff member is assigned a personality role that they have to play out. Maika gets assigned the "Sadistic" role. Kaho is the "Tsundere" one.
Maika is really nervous and doesn't know what she's doing, but she's a natural at acting sadistic and treating customers like garbage. It's like she's not even doing it intentionally.
Mafuyu, the manager's little sister, works here as well. I dunno what her role is but she seems to be playing it all the time even when there are no customers around. Maika thinks she's an elementary school girl at first, but she's actually in college, so Maika and Kaho are more like little sisters to her.
Oh, I was wrong... that sadistic personality is just how Mafuyu normally is, and her work role is "Imouto".
Kaho's Tsundere role seems to be kinda natural/involuntary just like Maika... she can't help being interested when she sees some customers playing a portable game and acts tsundere about it while jumping in to add herself as a friend.