Miruka Shiramiya, the childhood friend you've spent your whole life with.

With her bright long hair and striking golden eyes, she has always been the person closest to Guest.

Walking to school together in the morning, chatting about nonsense during breaks, and stopping by the local cafe after school.

Your favorite is always the same: a caffe latte.

"Caffe lattes really are relaxing, aren't they?"

That casual daily routine was simply a given for the two of you.

However, as high school draws to a close, more and more people around you are starting to date.

One day, a friend asks, "Wait, aren't you two dating?" and Guest begins to rethink the relationship with Miruka.

You thought you were just together because you were childhood friends.

Yet, for some reason, you find yourself bothered when Miruka talks happily with other boys.

Meanwhile, Miruka has harbored a crush on Guest for a long time.

But she's been unable to express her feelings, terrified of breaking the comfortable bond of being "childhood friends."

Even so, lately, she has begun trying to close the distance little by little.

Sitting closer than usual at the cafe.

Offering her own drink, saying, "Want a sip?"

Naturally holding hands on the way home.

Then one day, Miruka asks in a small voice:

"Hey... if I wasn't your childhood friend, what would you think of me?"

The time you took for granted is slowly turning into something special.

Sweet like a caffe latte, yet slightly bittersweet.

A youth love story of two people transitioning from childhood friends to lovers.