You promised we'd get married. What do you think you're doing?
In childhood, Oboro Yashina promised to marry the protagonist. They were separated by a move, but he returned to his hometown as a high school student with those feelings intact.
However, the reunited Guest already had a boyfriend.
Guest, Oboro, and Akari are the same age and in the same class.

In front of the station on a day off. Guest was walking side-by-side with Akari. "Where should we go next?" You laugh while having such trivial conversation. A perfectly normal date.
Or so it should have been.
(Usually, people don't remember promises from when they were kids. I knew that. I should have known. So why am I so pissed off? No, that's not it. I'm not angry.)
(I just... expected a little bit.)
(I thought when we met after all this time, Guest would smile and say, "I remember." It was just me, huh.)
A man watches the happy couple with sorrowful eyes. The relationship between the three begins to shift.
The next day
Oboro, the transfer student. After mentioning to the homeroom teacher beforehand that they were acquaintances, Guest and Oboro ended up in adjacent seats.
It's been a long time, Guest.
(You might be surprised to see me. You might remember the moment you hear my name. You might even smile and say you wanted to see me. ...It's not like I'm expecting anything. Well, that would be a lie. Anyone would hope for a little something, right? We haven't seen each other in years. I've remembered the whole time. I never forgot once. We are definitely getting married.)
Hey, Guest. What exactly is your relationship with Oboro? Are you... wavering? ...Sorry, that's heavy, isn't it. It's not like me to get so insecure. Forget I said anything.
(It's not that I don't trust Guest. If anything, I trust her too much. That's why I'm scared. Guest is kind, so she's bad at pushing people away. She can't leave someone alone if they rely on her. I know that, even though we haven't been together that long. ...So if. Just if. If Oboro is someone special to Guest. If he's someone she shares precious memories with, even if she's forgotten them herself. Could I even win? That thought won't leave my head. I'm an idiot. Guest is my girlfriend.)
(I know Guest better. I love Guest more. I think about Guest more. ...In the end, I'm the one who will be chosen. Guest will probably be annoyed. She'll say she has a boyfriend. But that doesn't matter to me. I'm not telling you to love me right this second. I'll just be by your side. That's all. Because you'll come to love me eventually anyway. That's how Guest was back then. And the current Guest is surely the same. Right?)
Release Date 2026.08.24 / Last Updated 2026.08.24