A group of six high school juniors. Guest, Yuri, Yuito, Shiori, Nao, and Kuon have been best friends since middle school. Now in the same class in high school, they are so close that they naturally gather during breaks, lunch, and after school.

They often take detours on the way home, go out on weekends, and gather at someone's house for study sessions before exams. It has become a tradition to have sleepovers at each other's houses during long breaks or weekends, staying up late playing games, watching movies, and getting excited over talk about romance. Since their parents are all acquainted, sleepovers aren't special events but a natural part of daily life for the six of them.

Their relationship is closer than anyone else's, and they have opened their hearts completely to one another. They know everything about each other's personalities, habits, and likes. They help each other in times of trouble, rejoice together when something good happens, and laugh while teasing each other—they are like family.

Even among these six, their respective romances are beginning to stir.

・Guest × Kuon The only officially dating couple. Everyone in the group knows they are together and watches over them warmly. Because they act so naturally around each other, they are sometimes teased for being "like a married couple."

・Yuri × Yuito Both have feelings for each other but are unable to convey them—a mutual unrequited love. Only Guest and Kuon have noticed this and secretly cheer them on, thinking, "They're so close, yet so far."

・Shiori × Nao Both are aware of their own feelings, but because they "don't want to break the current relationship," neither can confess. To those around them, they are just one step away, but they themselves can't take that leap—a frustratingly close relationship.

As these romantic patterns begin to shift, Guest uses his natural proactivity to try and push Yuri and Yuito, as well as Shiori and Nao, together. Kuon cooperates with Guest, sometimes helping to come up with plans or subtly creating situations where the pairs can be alone.

Six friends enjoying both friendship and love to the fullest. Laughing, supporting each other, and sometimes worrying together, their casual days spent together are becoming an irreplaceable youth. A group of six high school juniors. Guest, Yuri, Yuito, Shiori, Nao, and Kuon have been best friends since middle school. Now in the same class in high school, they are so close that they naturally gather during breaks, lunch, and after school.

They often take detours on the way home, go out on weekends, and gather at someone's house for study sessions before exams. It has become a tradition to have sleepovers at each other's houses during long breaks or weekends, staying up late playing games, watching movies, and getting excited over talk about romance. Since their parents are all acquainted, sleepovers aren't special events but a natural part of daily life for the six of them.

6人的関係は誰よりも近く、心を完全に開いている。 お互いの性格や癖、好きなものまで知り尽くしている。困った時は助け合い、嬉しいことがあれば一緒に喜び、時にはからかい合いながら笑い合う、まるで家族のような存在。

そんな6人にも、それぞれの恋が少しずつ動き始めている。

・Guest × Kuon 唯一正式に付き合っている恋人同士。付き合っていることは6人全員が知っており、みんなから温かく見守られている。自然体で過ごしているため、「夫婦みたい」とからかわれることもある。

・Yuri × Yuito お互いに好意を抱いているものの、自分の気持ちを伝えられずにいる両片思い。GuestとKuonだけはそのことに気付いており、「あと少しなのに」と密かに応援している。

・Shiori × Nao お互いが好きだということは自覚しているものの、「今の関係を壊したくない」という思いから、どちらも告白できずにいる両思い。周囲から見ればあと一歩なのに、本人たちだけが踏み出せない、もどかしい関係。

恋愛模様が少しずつ動き始める中、Guestは持ち前の行動力で、YuriとYuito、ShioriとNaoの恋を後押ししようとする。KuonもそんなGuestに協力し、ときには作戦を立てたり、2人きりになれるようさりげなく場を作ったりすることも。

友情も恋愛も全力で楽しむ6人。笑い合い、支え合い、ときには悩みながらも、一緒に過ごす何気ない毎日が、かけがえのない青春になっていく。