Uka Ishimori has one dream in to have fun in high school! As a self-avowed dense, stone-faced introvert who spent all of middle school hardening her heart against a daily barrage of bullying, breaking out of her shell is easier said than done. Luckily, she's not alone—Kai Miura, a classmate whose blond hair reminds her of the lemon soda he so enjoys, has her back. Step by step, she endeavors to cast off the shadows of her past and reinvigorate her life!

三浦くんを好きになり、新しい友達もできて…、羽花にとっては奇跡のような高校生活。みんなで出かけた新入生歓迎遠足では、思わぬ事件が待ち受けていて──!? 青く、甘く──。無限にときめく青春がここにある!

三浦くんの元カノ・芹奈と知り合い、自分との違いを見て羽花は自信を失う。それでも、三浦くんがくれた言葉に励まされ、彼を好きでいる勇気をもちたいと決意して──。 胸の高鳴りが止まらない! いちばん輝く青春は、ここで出会える!

It’s the opening day of Hachimitsu High’s culture festival! With its cute decor, tasty food, charming maids, and potential glimpses of Kai, Class 1-B’s Café Avail is doing better than anyone could have expected―and it’s all thanks to the pillar of the class, Uka. But even the strongest pillars can come crumbling down, and Uka gets a sudden reality check when she’s swarmed by irate girls demanding to know what relationship she and Kai have. Emboldened by the festival, Uka may have forgotten just how far apart her and Kai’s worlds are―but everyone else certainly hasn’t!

It’s summer vacation, and Uka’s social circle is dazzling! Hanging out at the beach, texting, going to karaoke…Uka has never had so many opportunities to experience fun with friends. But the start of her second term at Hachimitsu may signal storm clouds on the horizon, as her overprotective father doesn’t take so kindly to her new lifestyle. Will the friendships Uka has always dreamed of be ripped away as quickly as they came together?

いじめに遭っていると勘違いしたお父さんに、「高校を編入しなさい」と言われた羽花。お父さんも友達も、全部大切。両方あきらめないと決意したけれど――!?　迷って泣いてぶつかって…涙の数だけ、青春は輝く!!

Uka wants more out of her relationship with Kai—talking with him and receiving his help aren’t good enough anymore. With nothing left to fear, she’s decided to be honest about her feelings. On the day of the sports festival, what she finally tells him is...!?

ついに三浦くんと両想いになった羽花。奇跡みたいな事態に、心がいっぱいに。…でも、「両想い」＝「付き合う」!?　――付き合うって、どういうことなの？　すこしの不安と、大きな喜びと。大好きな人の、彼女になりました。

新学期。三浦くんとはクラスが離れてしまった羽花。寂しいけれど…、そこには予想もしない出会いが待っていて──!? 新しいクラス、新しい友達。青春はいつだって心が忙しい!

仲良くなったはずの奈乃は、三浦くんのことが好き…?? その本当の気持ちを羽花は知ることに──!! 恋の試練を乗り越えて、2人のキズナはますます強く。