Touya, tras comprar anillos de compromiso a sus cuatro prometidas, se plantea dar un paso más allá y anunciar oficialmente uno de sus enlaces, pero, para ello, deberá cumplir una hazaña para ahuyentar a otros pretendientes.

Cuando Touya y su séquito se disponen a buscar unas antiguas ruinos en el desierto, avistan un ser procedente de un antigua raza, los Phrase, lo que les plantea más preguntas que respuestas.

El negocio improvisado que Touya decide montar para las antiguas esclavas florece, lo que le llevará a ampliar el repertorio de libros que ofrecen… aunque sean de un género desconocido para él.

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.

Touya and the others pay a visit to a deserted island in search of more ruins of Babylon and thanks to the efforts of his ever reliable fiancées, they finally discover the Hangar.

Cloud, the Second Prince of the Kingdom of Linhea visits as the envoy for Sue's marriage proposal. While there, he begs Touya to use his teleportation magic to save his mother who is being held captive by Prime Minister Wardack.

Yumina proposes that all six of them go on dates to cultivate their love.

Touya rescues a girl in the forest, and while the technology of the Alchemy Ward is able to completely heal her, her memories remain lost and she's unable to remember her own name and how she got so injured. At her request, Touya names her Sakura.

The goddess of love pays a visit to Brunhild, calling herself Touya's older sister, Mochizuki Karen. Apparently she came there to refresh (enjoy a vacation) because Touya is so surrounded by love.

The group discovers the Tower and the Rampart of Babylon. Touya also completes the usual registration with their administrators, Noel and Liora. Meanwhile, there's sudden news from the Kingdom of Belfast that Queen Yuel has given birth.