[SPOILER ALERT! PLEASE READ VOL 3 ONWARDS OF THE LIGHT NOVEL BEFORE CONTINUING. OR READ AT YOUR OWN RISK!] [EDITED SUMMARY] Alas=Ramus came to Earth and appointed The Hero and The Demon Lord to be her parents. Of course, that's completely impossible since they're enemies. But how can they abandon such a cute baby? After some incidents that happened that involves the baby, The Hero is now fused with her! She doesn't have any other choice but to take care of the baby. But what about the Demon Lord? Alas=Ramus was actually the plant that The Demon Lord took care of for so many years. So technically, he really is the father of Alas=Ramus. I, The Hero Emilia, now goes by the name of Emi Yusa, was forced to ask The Demon Lord, my enemy but the father of my daughter to go shopping with me. That's just easy and simple, right? Well, not for the Hero and the Devil. A lot of complicated things happened in just one day. Why? Read and find out. This is the story of "My Day with The Devil".

A Gate manifests itself in the frontyard of the Provisional Demon Castle (a 60-year old six-tatami sized unit). And out from the Gate comes a little girl who calls the Demon King and the Hero 'Papa' and 'Mama'! To think that these two had such a history......Ashiya and Chiho are shocked to the core, yet the Demon King and the Hero themselves feel even more confused. In the end, a new housemate in the form of a little girl joins the Provisional Demon Castle crew, and the Demon King's life as a parent begins! To make matters worse, this family(?) of three brings up the issue of family outings, causing an endless amount of stress for the lovestruck highschool student Chiho! The third curtain is raised on the strange daily life of a Demon King-turned-working-class civilian! I do not own any part of this light novel. All rights go to ASCII Media Works. This is merely a fan translation of the original text.

A novel related from the anime of Date alive. it is translated in english please have fun reading this short story

A month has passed since the incident aand Tohka and all the others were acting strange. Exactly at 11:59. The clock strikes as a bright light fills the room. Looking over to Tohka and the rest, He sees ... Mayuri.