Changes of Heart Series by Kujira

After being dumped by her boyfriend, Koyori went to her longtime friend Hijiri's house to drink away her sorrow... and ended up spending the night with him! Not only that, he tells her he loves her -- and she's not sure how to reconcile the new development with someone she's known since they were kids. After all, the stakes are high -- if things don't work out, she'll hurt one of her closest friends. And to make matters worse, her ex wants to patch things up.. moreAfter being dumped by her boyfriend, Koyori went to her longtime friend Hijiri's house to drink away her sorrow... and ended up spending the night with him! Not only that, he tells her he loves her -- and she's not sure how to reconcile the new development with someone she's known since they were kids. After all, the stakes are high -- if things don't work out, she'll hurt one of her closest friends. And to make matters worse, her ex wants to patch things up...? Koyori needs to figure out what she wants, before she loses it all. less

Koyori's co-worker, Enomoto and his childhood friend, Sachi are two virgins, getting hitched! Enomoto, who works for a gaming company, is finally getting married to his longtime crush and childhood friend, Sachi! But the whole time they were dating, they never actually went all the way...

Hijiri is childhood friends with Koyori, who has recently returned his feelings. But after spending years as "just friends," it means that they're already teeming with nerves at a single date. With all that going on, they've managed to set up plans for an overnight trip together!

Childhood friends, Hijiri and Koyori have just gotten together, nurturing a first crush from long ago. However, they run into interference from both of their exes! While Koyori is struggling over that, Hijiri makes it clear that to her that he wants to focus on the "present" with her.

Childhood friends, Hijiri and Koyori have just gotten together. With their busy schedules, they still want to spend time with each other, so they make the decision to move in together! Visiting families, enjoying the summer festival and going on a shopping date, the nerves just don’t stop!

Childhood friends, Hijiri and Koyori are now officially together. On top of that, Koyori’s been put in charge of a project at work, and she also just moved in with Hijiri. Smooth sailing from here on out! Or so she thought… as their start having less time available to see each other, and she begins noticing small annoyances as they live together. What an ordeal for this childhood friends-turned-couple!

Childhood friends, Hijiri and Koyori are now officially together. They moved in together, got through their first big fight, and strengthened the bond between them. While they’re busy with work and taking a hot spring trip on Hijiri’s first birthday as a couple, Koyori’s ex-boyfriend makes the announcement that he’s getting married! Which gets the couple thinking about their future.

Koyori and Hijiri are two people who grew up together as friends, and are now a couple, living together. But when both of their exes marries the other, the two begin contemplating their own "marriage." But one time, in the midst of passion, Hijiri blurts out "Will you marry me??!" Is this it? Can it be? A proposal?!

Koyori and Hijiri are two people who grew up together as friends and are now a couple, living together. When they enter a long distance relationship due to Hijiri's work transfer, they agreed to put off marriage for a just a little bit. But due to their busy schedules, they become more tactful of each other, and end up missing the mark with each other. So, with the other's happiness in mind, they decide to break up. But months later, Koyori runs into Hijiri again…!