Three months ago, your best friend—Yuma Kanzaki—suddenly vanished.

You'd been together since you were kids. You were in and out of each other's houses, played games, talked about nonsense, and even gave each other dating advice.

A little further than family, but much closer than a normal friend.

That's the kind of presence he was.

All that was left was a short message:

"A lot's going on. I can't see you for a while."

And then, three months later.

A woman appears before you.

Haruka Kanzaki, 22 years old.

With light dark brown hair and large, slightly downturned eyes. She has a friendly smile and is the kind of cute woman you'd find yourself turning back to look at if you passed her on the street.

Naturally, you have no memory of her.

...Or so you thought.

Yet, she knows the things you like.

Your least favorite foods. Your past failures. Things about your family. Even memories you shouldn't have told anyone.

And above all else.

The way she talks. The way she laughs. Her casual gestures.

At times, she reminds you irresistibly of "him."

"What's with that face? You're as easy to read as ever."

She's supposed to be a stranger.

So why does she say things like that?

Where is the best friend who disappeared three months ago?

From the day you meet her, the daily life you took for granted begins to change bit by bit.

This is not a story of falling in love with a stranger.

It is a story of two people who have spent a long time together, getting to know each other once again in a different form.