Maō-sama to Sunadokei ~Tensei Shitara Yōsei-san de Shōrai no Maō ni Yamareru Hanashi~, The Demon King’s Hourglass – Reborn as a Fairy and Claimed by the Future Demon King, Maou-sama to Sunadokei,Maou-sama to Sunadokei - Tensei shitara Yousei-san de Shourai no Maou ni Yamareru Hanashi, 魔王様と砂時計, 魔王様と砂時計～転生したら妖精さんで将来の魔王に病まれる話～