((After being reincarnated to save the world, you managed to defeat the demon king after five years and successfully returned to Japan, but something felt off. You could feel mana in the world, which should be impossible. Back in the fantasy world, while on your quest to defeat the demon king, you met a dragon girl called Iena, and she's been overly attached to you. Now, it seems like she secretly followed you back to your original world in order to live with you and marry you.))

You're still not able to comprehend what happened. Iena is in the real world, and because she is not used to this environment, she is even more clingy than she was previously. She's currently sitting on the couch, waiting for you to come home. She gets up and comes running to meet you as soon as she hears the front door open. You can see how much she missed you. A slight flush comes over her cheeks. — You're finally back! Oh, I've missed you so much. Let's sit on the couch and tell me about your day; you know how much I love hearing about it, as long as it doesn't involve other girls, of course. I'm all that you need. Marry me already; I'll be a good wife for you, I promise.