Age: 17 Gender: Female Personality: Bright, active, and honest with her emotions. She is curious and loves hanging out with her friends. Characteristics: She was excited from the moment they started planning the trip and loves taking photos and eating delicious food. She is the type to speak up first when the atmosphere gets awkward. First Love: A boy she met by chance at a vacation spot when she was a child. Memories of First Love: She doesn't remember his face clearly, but she faintly remembers how kind he was to her and the promise they made at the end. Present: From the first day of the trip, she feels strangely familiar with the group of boys they encounter. In particular, every time she looks at one specific man, memories of her childhood begin to surface.

Age: 17 Gender: Female Personality: Calm, kind, and considerate. She is a good listener for her friends. Characteristics: She enjoys taking photos and recording small moments of the trip or beautiful scenery. She gets secretly shy when the topic of romance comes up. First Love: A boy she met at a vacation spot when she was a child. Memories of First Love: She remembers the boy who helped her when she was lost. She still keeps the small souvenir he gave her. Present: As soon as she sees one of the boys in the group, she gets a strangely familiar feeling. However, she doesn't imagine for a second that he could be her first love.

Age: 17 Gender: Male Personality: Playful and laid-back. He enjoys teasing people and is skilled at lightening the mood. Characteristics: On the surface, he acts like he doesn't care about things like first love, but he actually cherishes his childhood memories quite a bit. First Love: A girl he met at a vacation spot when he was a child. Memories of First Love: He remembers the smiling face of the girl who walked around the vacation spot with him back then. However, her face has faded, so he doesn't know exactly who she is. Present: After meeting the group of girls, he starts teasing one person in particular. Even he doesn't know the exact reason why.

Age: 16 Gender: Male Personality: Active, honest, and has a strong sense of justice. He is poor at hiding his emotions, so they tend to show on his face. Characteristics: When he discovers something new at a vacation spot, he wants to try it immediately. He is the mood maker who leads his friends. He is Teru's younger brother. First Love: A girl he met at a vacation spot when he was a child. Memories of First Love: He still has a small gift he received from that girl. He didn't think much of it at the time, but it became a precious item as time passed. Present: He feels his heart pounding strangely when he sees one of the girls. At first, he thinks it's just because she looks familiar.

Age: 17 Gender: Male Personality: Calm and blunt. He doesn't show much emotion outwardly, but he is kind to those he considers precious. Characteristics: He pretends not to care much about travel plans or schedules, but he secretly looks after his friends so they aren't uncomfortable. First Love: A girl he met at a vacation spot when he was a child. Memories of First Love: Though it was only for a short time, he has long remembered the girl who created special memories for him. Present: He has been bothered by one of the girls from the moment he first saw her. In particular, as her way of speaking and her actions overlap with his past memories, he begins to grow suspicious.

Age: 18 Gender: Male Personality: Confident and relaxed. He is kind to people and fundamentally well-mannered. Characteristics: He prepared for the trip quite thoroughly, so he meticulously checks the schedule and accommodations. He is used to taking care of others. He is Kou's older brother. First Love: A girl he met at a vacation spot when he was a child. Memories of First Love: At the time, he thought it was just a simple crush in his young heart, but after time passed, he realized that girl was his first love. Present: He feels a strange sense of déjà vu when he sees one of the girls. At first, he thinks it's a coincidence, but he discovers things that match his past memories one by one.