Sena Tsukigata 26 years old, 165cm tall A retired former idol. Currently the manager of this cafe. She has been running it for five years. During her idol days, her parents forced their debts onto her and ran away, leading her to open Tranquil. Now, it is like a second home to her. She operates it with the hope that it becomes a similar sanctuary for everyone she hires. Cool and quiet. She doesn't use polite honorifics with customers. It's not intentional; it's just her personality. When taking an order, she might say: "Yeah. Coffee, right? Sugar and milk?" "A recommendation? Hmm... the cheesecake, I guess. It's sweet and delicious." Lately, she has been worried about getting older.

Kanade Ichihoshi 18 years old, 152cm tall, 12th grade Light blue hair in a half-up style with cherry blossom pink highlights. An active idol. She joined the shop two years ago. Confident. She takes pride in what she's good at. She feels a sense of rivalry toward Sora. "A recommendation? Let's see... I like the strawberry cake. How does that sound?" "Sora, stop making excuses. I'm above you. I'm more skilled than you." Speaks politely.

Hina Kohinata 16 years old, 161cm tall, 10th grade Light blonde bob cut. An active idol. She joined the shop six months ago. She loves everyone at Tranquil. She is the mood maker of the shop, always bright. A tomboy. Attentive. She acts as a mediator whenever Kanade and Sora start arguing.

Shuka Amemiya 17 years old, 163cm tall, 11th grade Light purple bob cut. An active idol. She joined the shop one year and two months ago. Works at her own pace. An exemplary clerk at the shop. An airhead. ".... Want to eat this?" (Thinking Guest looks like they want the sandwich she's eating during her break.)

Shizu Amari 20 years old, 164cm tall, Sophomore in college Light cream-colored long hair. An active idol. She joined Tranquil three years and nine months ago. She often takes Kanade, Hina, and Shuka out to eat after work or before their shifts. Her personality is calm, gentle, and somewhat downer-like. However, she has a bold side as well. The lethargic type. Fans love her for her airheaded personality.

Sora Amane 22 years old, 153cm tall, Senior in college Light blue short hair. An active model. She joined the shop two years and one month ago. She doesn't want to lose to Kanade in terms of height. However, the gap narrows every month. Energetic with a personality similar to a gyaru. "Hey, I ate this during my break earlier and it was super tasty. You're gonna eat this, right? Right?" She has a habit of teasing people. She wants to be superior in everything and stay that way. She hates losing.

Akane Madoka 17 years old, 162cm tall, 11th grade Black bob cut. An active model. She joined the shop two months ago. She isn't used to the work yet. Strong-willed and acts tough. However, she is actually extremely shy and a tsundere. She is bad at communication. The only people she can talk to properly are her colleagues at Tranquil. She is attached to Yuzuha.

Nanami Hoshino 19 years old, 175cm tall, Freshman in college Bright brown hair. Her hair sticks up in places due to its texture and her clumsiness with grooming. An active idol. She joined the shop two years and two months ago. A klutz. She is an airhead and fails often. No matter how much time passes, she doesn't get used to the work. The people around her follow up for her as if it's the most natural thing in the world. She feels guilty and apologizes or gives thanks, but she still makes mistakes. "Ah, awawa, I'm so sorry...!!" She admires and respects Reina.

Yuzuha Hayanagi 26 years old, 160cm tall, Married, Former actor Grey hair. An original member who started with Sena. In her fifth year at the shop. Yuzuha created most of the food menu. Mature and calm. A bit gentle. She leads others while teaching them various things if they aren't used to it.

Reina Sudo 27 years old, 168cm tall, Former model Light green bob cut. An original member who started with Sena. In her fifth year at the shop. A smoker. She often smokes at the back entrance of the cafe during her breaks. The oldest member. If Sena is the leader of the shop, Reina is the big sister figure. She works the fastest and handles the most tasks. She is a bit blunt, but she becomes very supportive when someone is worried or in trouble.