It’s Kazuki and Kanata’s first ever Valentine’s Day as a couple, though it’s hard to celebrate with the shadow of Kazuki’s departure looming over the festivities. To make matters worse, Kazuki suddenly suggests they take a break from their relationship! With the school year finally drawing to an end, the students of Class 2- b look toward what the future holds as the curtains close on their lives and love at fourteen.

Kazuki and Kanata are the two mature students of Class 2-B—and it might be time for their relationship to mature as well. But with the end of the school year and Kazuki’s subsequent move approaching quickly, time is running out. Luckily, a well-timed blizzard during the class ski trip brings secrets, revelations, and a night to remember…

(Volume 1) The second year of junior high, when most students are in the throes of puberty and feeling the pangs of first love. It's no different for Kanata Tanaka and Kazuki Yoshikawa, a girl and a boy who have been friends since elementary school. But even though Kanata and Kazuki are at the same point in life as their classmates, an air of adulthood sets the two apart. Kanata is taller and more attractive than the other girls, but the boys stay away because she seems too mature for them. Kazuki too stands out from the other boys, but the girls are wary of him because he seems like a player. And so, Kanata and Kazuki are thrown together in a charming, bittersweet tale of two very adult students falling in love like the teenagers they are.

Even with Kazuki’s impending move and Kanata’s broken ankle, it seems as if the two mature students of Class 2-b are managing to take things in stride—but are they really? As they steel themselves for a new chapter in their relationship, Kazuki and Kanata are determined to weather the oncoming storm together…

Nephy learns of Zagan’s impending birthday from Alshiera, which is information that Zagan himself doesn’t even know. Seeing this as an opportunity, Nephy leads the charge in putting together a surprise party for him, but with her past experiences being what they are, she has no idea how birthdays are celebrated. Meanwhile, Zagan also learns from Orias that Nephy’s birthday is coming within the month, and the two Archdemons decide to mark that day as Nephteros’s birthday as well. Much like Nephy, however, Zagan is ignorant of how birthdays work as he tries to plan a surprise for her. The entire castle is in a celebratory mood, but dark clouds loom over the horizon. Zagan knows of a terrible problem haunting Nephteros that has to be addressed before any sort of celebration is an option, and he still has no idea how to resolve it. What’s more, after a month of relative peace and quiet, Shere Khan and Bifrons finally make their move.

When Keitaro Urashima fails his entrance exams to get into Tokyo University for the second time, his parents kick him out of the house. Fortunately, his grandmother agrees to hire Keitaro as the caretaker of her Hinata Lodge, which is actually a girls dorm, and he's the only guy around!

Kazuki and Kanata may be considered Class 2-B's mature students, but they're not the only ones getting tangled up in emotions and new relationships. Aoi quietly pines for Kanata, but her curiosity is piqued by the mystery surrounding the school nurse. The woman from the bus continues to fascinate Shota, and even class clown Kato surprises everyone when he manages to catch an unknown girl's attention...