Touya visits the capital city of the Regulus Empire to stock some books for the library café, Moon Reader, only to witness the town engulfed in the flames of war.

Lucia finds herself attracted to Touya after he resolved the coup d'etat at the Regulus Empire. Picking up on that, Yumina proposes that they welcome Lucia in as Touya's fifth fiancee.

Touya discovers a new ruin of Babylon, the Alchemy Ward of Babylon, he goes through the administrator's compatibility check and becomes the Master of Flora.