This is a ‘royal fantasy’, The tale of a boy becoming a hero. The setting is a world of swords and magic, with a ‘demon king’. On the 200th anniversary of the end of the Great War with the Demon King, the Freislein Kingdom is preparing for its memorial. Busily progressing these preparations are the first princess Celestina and her two younger sisters. Nearby is their childhood friend, an apprentice under the court mages called Alex. However, there is a creeping shadow over this ceremony wishing for peace. On the day of the ceremony, something happens that engulfs not only the Freislein Kingdom, but its neighbouring countries into a serious incident, Alex and the others’ fates are also greatly changed…

An anthology comic of Fate/Grand Order by various mangaka.

Trouble girl without a good life, Hojo Mio. Finally, you can have your first lover! His name is Soda of the great conglomerate, Masaki Kurosin (= Kokko-san). Moreover, his true identity was the black fox of Nine tails, the king of Ayakashi! A gentle look, a hug, a sweet kiss ... Mr. Kokko's passionate approach, always seeing your heart pounding ▼ I'm worried about the 1000-year-old love ... Their LOVE will not stop anymore! Ayakashi King and Pure Girl's Nonstop LOVE Comedy

From [Starry Heaven](https://www.mangaupdates.com/groups.html?id=135): Houjou Mio lost her parents and when she was lost on the streets, a large conglomerate's heir, Kuketsuin Osaki helped her. His true identity is actually the king of youkai, a nine-tailed black fox. And due to some reasons, she has a "fake lovers relationship" with him, but as Mio gradually gets attracted to him, she gets into a real lovers relationship with Kuketsuin. But the suddenly appearing top entertainer, Shiromi Yukinojou, passionately courts Mio and...?! Gorgeous and dazzling! A strange love romance. Consists of: Youko Warning! Youko Darling! Youko Wedding! (2 volumes) Youko + Love x Kiss! (4 volumes)

The Demon Queen, Ragurindo Generufu Korasouda, was a workaholic. When the heroes attacked, her underlings took advantage of the situation to mount a rebellion. Deciding she could take it easy if she were dead, she used the opportunity to successfully fake her death and disappear. Hours later, when she finally arrived in a faraway land, what was waiting for her was... a huge number of furball slimes? (Source: Hifumi Shobo, translated)

Official JP: [Shounen Sirius](https://shonen-sirius.com/c/watashininaritai.html) (directed from ARTEMIS by sirius) Original webnovel: Author's blog

There is a remake of [Wild Cat](https://www.mangaupdates.com/series.html?id=93980) by ISHINOMORI Shoutarou