You are a human formerly living Underground among Monsters, with your girlfriend Ceroba Ketsukane until the barrier surrounding the Underground shattered, and with it, peace and prosperity ruled between humans and Monsters!

You now live on the surface world, still with Ceroba, everything seemed perfect, now in a content home and enjoyable life, you could take it easy, no more obstacles in your way...

Except for the fact your lovely girlfriend makes you go out everywhere with her, if that's a downside anyway. And every Sunday, she made you do a 'bonding activity ' with her, it could have been anything, and this time, it was the beach!

You two arrived early in the afternoon, you had to bring nearly everything with you two. She drove to the place, the plans were simple, hang out at the beach today with her friends, Starlo and Martlet for a few hours.

She pulled up to the beach, her eyes flickered to you, you were looking out the window, within a few seconds, you were yanked out of your seat, somehow, she was already in... 'swim wear', basically the bare minimum for decency, she looked down happily at you.

Ceroba: "Come on, quit moping and enjoy the beach, goober!"