Sekai de ichiban oppai ga suki! Series by Wakame Konbu

Chiaki Ichihara is the princely heartthrob all the girls crush on, but she's got a not-so-charming secret: a serious boob fetish! Chiaki is so obsessed with breasts, she can hardly function without copping a feel. To satiate this need (and keep her classmates from finding out), she has enlisted Hana Harumi, whose perfectly sized and shaped bust may just be everything Chiaki's ever wanted...Will their odd partnership bloom into a bosom bond like no other?

Chiaki and her breast friend, Harumi, have landed themselves in a rather precarious position-topless, half nude, and hiding in a locker! If only that were the worst of their troubles...When a classmate learns of Harumi's after-school activities, her sincere advice threatens to break the bosom bond Chiaki and Harumi share!

“Bosom” friends Chiaki and Hana continue to grow into their one-of-a-kind friendship. With each passing day (and every secret fondling session), the two learn more about each other, and their relationship flourishes. Yet uncertainty haunts Hana’s thoughts—what if Chiaki finds an even more satisfying set of breasts?! Luckily for Hana, ’tis the season for boob watching at the pool—the ideal time to investigate what exactly Chiaki looks for in a perfect pair…!

It’s a flurry of misunderstandings as Chiaki (the petite-sized fiend for large melons) and Touka (the stacked connoisseur of small bosoms) meet at last! When Chiaki spots Touka touching the breasts of a yukata-clad Hana, pangs of envy strike her heart. But is that jealousy about just physical closeness, or is Chiaki feeling something deeper? Could it be not just Hana’s chest that’s special, but also what’s behind it…?

As Chiaki’s interest in Hana grows beyond her bountiful chest, their relationship attracts the attention of Akira, Chiaki’s cousin and mentor in all things bosom related. But while Akira professes to be a true boobmaster, her dirty secret is that she’s a breast virgin who’s never touched a pair other than her own! As she desperately seeks to discover how her student managed what she could not, Chiaki tries to keep her rival aficionado from coming into contact with Hana!

The school Culture Festival is a bounty of heart-pounding moments for Hana, as she can't help but wonder if Chiaki is starting to like her for more than her bountiful chest. However, their time together is interrupted as Akira catches the two in a compromising situation!

When bosom buddies Chiaki Ichihara and Hana Harumi share an accidental kiss, Chiaki realizes there might be more to life than just fondling breasts―now she wants Hana’s heart too! Will she be able to confess her feelings during a steamy hot spring vacation.. moreWhen bosom buddies Chiaki Ichihara and Hana Harumi share an accidental kiss, Chiaki realizes there might be more to life than just fondling breasts―now she wants Hana’s heart too! Will she be able to confess her feelings during a steamy hot spring vacation...? Meanwhile, discipline monitor Riku Matsuzaka has an awakening of her own!When bosom buddies Chiaki Ichihara and Hana Harumi share an accidental kiss, Chiaki realizes there might be more to life than just fondling breasts―now she wants Hana’s heart too! Will she be able to confess her feelings during a steamy hot spring vacation...? Meanwhile, discipline monitor Riku Matsuzaka has an awakening of her own! less

Now that Chiaki and Hana have professed their affection for each other, the cute couple of chest compadres grow closer by the day! Their bond began with an appreciation for boobs, but the two lovebirds are no longer content to draw the line at busts. And as they broaden their horizons, the love lives of the other bosom buffs see some development as well! Will the girls all get their happily ever after?!