Takami Akai

Petite Princess Yucie follows the adventures of country-girl Yucie as she is admitted by chance to the prestigious Princess Academy, where the daughters of royalty and nobles attend to learn magic, dance, etiquette, defense, art and music. There, she experiences many things in her quest to collect the "fragments" of the Eternal Tiara in hopes that she may become the legendary Platinum Princess, who is chosen every 1,000 years. Yucie, along with the four other Princess candidates who are in (myanimelist.net)

The mythical eight-headed serpent Orochi was created by aliens, which invaded Earth in ancient times. 2000 years later, they dispatch the Orochi again to destroy Japan and the rest of the world. Only a team of the Japan Self-Defense Forces and a scientist can destroy it.