花野井くんと恋の病 [Hananoi-kun to Koi no Yamai] Series by Megumi Morino, 森野萌

Hotaru is a 16-year-old high school first-year who has always been ambivalent about love, preferring instead to have a lively life with her family and friends. So when she sees her schoolmate, Hananoi-kun, sitting in the snow after a messy, public breakup, she thinks nothing of offering to share her umbrella. But when he asks her out in the middle of her classroom the next day, she can't help but feel that her life is about to change in a big way...

Hotaru is a 16-year-old high school first-year who has always been ambivalent about love... but somehow or another, she's found herself going out with Hananoi-kun, the pretty boy from the class down the hall who, as it turns out, is a little too romantic for his own good. But they're not official yet; they're going out on a trial basis, and once Christmas Day comes, they'll be perfect strangers again. Hotaru was fine with that... until Hananoi-kun gave her the happiest Christmas Eve of her life... moreHotaru is a 16-year-old high school first-year who has always been ambivalent about love... but somehow or another, she's found herself going out with Hananoi-kun, the pretty boy from the class down the hall who, as it turns out, is a little too romantic for his own good. But they're not official yet; they're going out on a trial basis, and once Christmas Day comes, they'll be perfect strangers again. Hotaru was fine with that... until Hananoi-kun gave her the happiest Christmas Eve of her life. Now, with the deadline just hours away, Hotaru's beginning to have second thoughts... less

Hotaru finally realizes she loves Hananoi-kun. Now she's got to find a way to tell him how she feels! There's just one problem: she's got a new coworker…Yao-kun, her old friend from elementary school! Memories of childhood trauma come rushing back…and Hotaru knows that she's going to have to face them if she ever wants to know what it's like to be in love.

Hananoi-kun and Hotaru's trial run is over. They're officially boyfriend and girlfriend now! Their first official date leaves Hananoi-kun determined to tell Hotaru how he really feels... but before he can, she's got a surprising request for him!

Hotaru Hinase and her boyfriend, Hananoi-kun, prepare for the beginning of their second year of high school... and their feelings for each other grow stronger by the day. Just as Hananoi-kun begins to show signs that he's ready to come out of his shell, Yao-kun, his rival in love, discovers his secret... and he's determined to make him come clean to Hotaru.

Hananoi and Hotaru have finally enjoyed their first kiss. While Hananoi waxes nostalgic about a "friend" from grade school, the floored Hotaru resolves to make him happier than ever. They both promise to become an even better couple, and more and more people are starting to gather around them...?!It's volume 6 in the tale of a girl who doesn't understand love and a guy who loves laying it on thick!

Hotaru and Hananoi-kun have been together for half a year now. With every passing day, they grow that much closer... and the first summer break of their relationship is right around the corner! Hotaru decides it's time to work on her appearance if she wants to be a good girlfriend for Hananoi-kun... and just as soon as they get that worked out, an all new romance seems to be budding in their friend group!

As they begin their first summer break since getting together, Hotaru and Hananoi-kun vow to experience even more "firsts" together! But all their plans are derailed when Hananoi-kun's father suddenly returns from overseas! Then, Yao-kun finally admits to his feelings for Hotaru... just in time for the two of them to have an intimate moment at the summer festival!

It's been six months since Hotaru and Hananoi-kun became official, but lately, Hananoi-kun has been acting strangely. Finally, on their first date in a long time, he spills: "We met once before, long ago." Meanwhile, Hananoi-kun seems to have gotten involved with another girl…?! The past and the present intertwine as our couple moves to the next stage!

After Non-chan-the girl who assaulted Hotaru many years ago -- moves back into town, things between Hotaru and Hananoi-kun grow tense. Hananoi-kun's attempt to prevent Hotaru from getting hurt again itself hurts her. Can he work through this problem and leave his harmful tendencies behind him? Or will this be the end for our couple?! Their mismatched love story takes a new turn!

Hotaru and Hananoi-kun have reconciled their present in light of their shared past and decided to continue their relationship. Now that they've gotten through their first fight, they should be closer than ever…shouldn't they? On top of that, Yao-kun and Satomura-san find their own relationship on the rocks! Things for everyone have changed in the year since Hotaru and Hananoi-kun got together... moreHotaru and Hananoi-kun have reconciled their present in light of their shared past and decided to continue their relationship. Now that they've gotten through their first fight, they should be closer than ever…shouldn't they? On top of that, Yao-kun and Satomura-san find their own relationship on the rocks! Things for everyone have changed in the year since Hotaru and Hananoi-kun got together. And now that Christmas is almost here once more, Hotaru and Hananoi-kun face their first "first" a second time… less

Hananoi-kun and Hotaru have only grown closer after overcoming their first real fight. And then, during a New Year's Eve date, Hotaru says “I don't want to go home tonight.” Hananoi-kun is shocked at first, but it seems she has a legitimate reason…! Nothing will be the same as the two ring in the New Year together with big changes in store for Hotaru's life!

It's now Hotaru and Hananaoi-kun's second winter together. Hotaru's dad invites Hananoi-kun over for lunch, where he happens to see a familiar face in an old photograph. Then, just as the third term at school is beginning, Yao-kun leaves the bookstore, and the new hire who replaces him is a mysterious older boy who catches Hotaru's attention…

Hananoi-kun has made the discovery that Ginji-san, the older man who was his “friend” throughout his childhood, was actually Hotaru's grandfather! He resolves to tell her everything, but Hotaru misses their date in order to help Yao-kun's little siblings get to the hospital. Wanting to make up for the date she blew off, Hotaru herself resolves to take things between her and Hananoi-kun to the next level on the night of their one-year anniversary…