Touya is now engaged to Yumina, Elze, Linze, and Yae, and he's enjoying his second life in another world as the five of them complete an extermination quest for mythril golems in order to raise their adventurer rank.
Leen notifies Touya that's she's discovered another ruin of Babylon, so they head to the Rabbi Desert in the Burning Kingdom of Sandora. Along the way the discovered a group of stranded people under attack by crystalline monsters known as the Phrase.
Touya establishes the library café, Moon Reader, partly to give those who were stranded a place to work. Then he uses the profits from mass producing bicycles at the Workshop to buy up lots of books.
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.
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 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.
