Mao Ni Nattanode, Dan John Tsukutte Jingai Musume to Honobono Suru 15 (Kadokawa Books) [Light Novel]

[Machine Translation] Yuki, the Demon King, is unwillingly serving as the emperor of the empire. While enjoying the homemade food of the girls living in the dungeon and being comforted by his wives, he is busily preparing for a competition in which many different races will participate. But then, a number of disturbing elements start to interfere with the event, and Yuki finds herself in a bind! However, Yuki decides to take advantage of the situation and bring about an incident involving the kings of the demon world in order to carry out a "certain plan" that he has been thinking about for a long time...? The Demon War Festival, in which many conflicting agendas are involved, is finally underway!

不本意ながらも帝国の皇帝を務めている魔王ユキ。ダンジョンに住む少女達の手作り料理に舌鼓をうったり、嫁達に癒やされながら多種族参加型の競技会開催に向け慌ただしく準備を進めていた。そんな中、不穏分子による妨害行為が多発して頭を抱えることに!しかし、ユキはそれを逆手に取り、かねてより考えていた「ある計画」を実行するため、魔界王達を巻き込み事件を起こすことに...!?数多の思惑が錯綜する魔戦祭、ついに開幕!!