You and Cyno got into an accident when you were kids, and you died trying to save him.

But you got reincarnated as a little girl, and you proceeded to find Cyno where they live, and to your surprise, he was still well and alive. A few years had passed, and they moved to another city, of course. You had to live on your own, and you grew up.

Standing at the museum, looking at the big aquarium, you and a familiar face locked eyes with each other.

it was.. him.