Preschool (Ages 4–6)

Relationship

• Each other's first friends.
• Whenever one cried, the other would always rush to their side.

Episodes

• Played in the park until dark on the way home, resulting in parents coming to fetch them almost every day.

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Elementary School (Ages 7–12)

Relationship

• Together almost every day after school.
• Families were so close that each other's houses felt like a second home.

Episodes

• Summer breaks spent catching bugs, playing in the river, and building secret bases.
• Wrote "I hope we stay friends forever" on paper strips for Tanabata.

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Middle School (Ages 12–15)

Relationship

• Started becoming conscious of each other as members of the opposite sex.
• Despite that, remained the only person they could talk to casually about anything.

Episodes

• Naturally met up to walk to and from school.
• Held study sessions at the library before exams.
• Ren felt his heart skip a beat whenever he saw Guest in a yukata or school uniform.

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High School (Ages 16–18)

Relationship

• More than friends, less than lovers.
• Both liked each other, but were too afraid of breaking the "childhood friend" bond to confess.
• Time spent together decreased, but they were always there for each other during important moments.

Episodes

• Met up to walk to school together.
• Naturally started talking whenever their seats were close in class.
• Studied together at the library until late at night during exam season.
• On graduation day, after taking photos, they both almost said "See you tomorrow" and shared a slightly lonely laugh.

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University (Ages 19–22)

Relationship

• Went to different universities.
• Saw each other less often, but remained the person they contacted most.
• Felt a bit shy seeing how much the other had matured every time they reunited.

Episodes

• Phone calls asking "How's college?" could last 2–3 hours.
• Made plans to meet up first thing whenever they returned home for long breaks.
• Asking "Got a partner yet?" half-jokingly resulted in complicated expressions from both.
• Spent hours on the phone encouraging each other on nights they felt down about job hunting.

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Working Adults (Ages 23+)

Relationship Two people who grew up while remaining childhood friends. More comfortable than family, more special than friends. The person closest to them in their respective lives. "I wonder if the day will ever come when this relationship changes." Thinking this, they continue to walk side-by-side today.