Axie Oh Books in Order (Updated March 7, 2026)

Axie Oh’s books fall into four clear shelves. The Rebel Seoul books are one YA sci-fi duology. XOXO and ASAP are contemporary K-pop romances, with the second book positioned as a companion rather than a strict sequential sequel. The Girl Who Fell Beneath the Sea stands alone. The Floating World and The Demon and the Light form a fantasy duology and should be read together.

Because of that, there is no single master continuity across everything she has written. The better question is which shelf you want first.

Shelf one: the sci-fi books

Rebel Seoul series

1. Rebel Seoul (2017): In war-scarred Neo Seoul, pilot Lee Jaewon is recruited into an elite weapons division and becomes entangled with Tera, a supersoldier created to pilot giant war machines, forcing him to question the regime he serves.
2. Rogue Heart (2018): Two years later, telepath Ama is drawn into resistance work and discovers that the Alliance commander she must infiltrate is Alex Kim, the boy who once betrayed her, pushing the series from military spectacle into espionage, rebellion, and personal fallout.

This is the simplest sequence in Axie Oh’s catalog. Read it in order. The second novel follows the aftermath of the first and works best once you already know the political world and the earlier war.

Shelf two: the contemporary romance books

K-pop companions

1. XOXO (2021): Jenny, a gifted cellist, falls for Jaewoo during one unforgettable night in Los Angeles, only to find him again at an arts academy in Seoul and discover that he is a K-pop idol who is not supposed to date.
2. ASAP (2023): Sori and Nathaniel, familiar faces from XOXO, move into the center in a second-chance romance shaped by idol pressure, family expectations, public image, and the question of whether either of them can choose a life that is actually theirs.

These books are connected, but not in the same way as the sci-fi duology or the Floating World duology. ASAP is presented as a companion to XOXO, so it can stand more independently, but XOXO is still the cleaner place to begin if you want the full emotional context.

Shelf three: the standalone fantasy

1. The Girl Who Fell Beneath the Sea (2022): To save her brother and her village, Mina takes the place of an intended sacrifice and is swept into the Spirit Realm, where gods, demons, and an enchanted sleeping Sea God turn a folktale-inspired premise into a self-contained fantasy quest.

This is Axie Oh’s easiest standalone entry point. You do not need any other book first, and there is no sequel attached to it.

Shelf four: the current fantasy duology

The Floating World duology

1. The Floating World (2024): Sunho, an amnesiac ex-soldier in the Under World, and Ren, an acrobat with hidden silver light, collide on a journey shaped by demons, memory loss, hunted power, and a Korean-legend-inspired fantasy world.
2. The Demon and the Light (2025): After the first book’s upheaval, Ren is pulled into court politics and war while trying to save Sunho from the monstrous transformation consuming him, making this the direct continuation and finale of the duology.

This is a true two-book sequence. Read The Floating World first and go straight into The Demon and the Light after it.

Publication order

1. Rebel Seoul (2017): A military sci-fi debut about loyalty, mech combat, and resistance inside Neo Seoul.
2. Rogue Heart (2018): A follow-up built around espionage, telepathy, and the next phase of the rebellion.
3. XOXO (2021): A K-pop romance about music school, celebrity rules, and falling for the wrong person at the right time.
4. The Girl Who Fell Beneath the Sea (2022): A folktale-inspired standalone set in a spirit world of gods and curses.
5. ASAP (2023): A companion romance that shifts focus to Sori and Nathaniel.
6. The Floating World (2024): A romantic fantasy opener about a hunted girl with silver light and a swords-for-hire hero with missing memories.
7. The Demon and the Light (2025): The second and final Floating World book.

The most useful reading orders

If you want the safest starting point

Start with The Girl Who Fell Beneath the Sea. It is standalone, representative of Axie Oh’s mythic fantasy mode, and requires no commitment beyond one book.

If you want the best “read everything” path

1. Rebel Seoul
2. Rogue Heart
3. XOXO
4. ASAP
5. The Girl Who Fell Beneath the Sea
6. The Floating World
7. The Demon and the Light

This route follows publication order while keeping the companion and duology relationships intact.

If you want the strongest fantasy-only path

1. The Girl Who Fell Beneath the Sea
2. The Floating World
3. The Demon and the Light

That gives you one complete standalone first, then the current duology.

If you only want romance

1. XOXO
2. ASAP

That is the cleanest lane if the draw is K-pop, Seoul, and contemporary romance rather than fantasy or sci-fi.

Where order matters, and where it does not

Order matters most in Rebel Seoul → Rogue Heart and The Floating World → The Demon and the Light. Those are the places where plot continuation matters directly.

Order matters less with XOXO and ASAP because the second is a companion-centered story, but publication order is still the better first-read path.

Order does not matter at all for The Girl Who Fell Beneath the Sea, because it is fully standalone.

Latest release status

The newest Axie Oh book currently released is The Demon and the Light, which Macmillan lists as on sale on October 21, 2025. I did not find a newer officially listed Axie Oh title beyond that in the sources checked.

FAQs

What Axie Oh book should I read first?

For most readers, The Girl Who Fell Beneath the Sea is the best first book because it is standalone and gives a strong sense of her fantasy style.

Do I need to read ASAP after XOXO?

That is the best route. ASAP is a companion novel, so it is more flexible than a direct sequel, but XOXO gives the fuller setup.

Is The Girl Who Fell Beneath the Sea part of a series?

No. It is a standalone novel.

Is The Demon and the Light a sequel?

Yes. It is the second and final book in The Floating World duology.

Which Axie Oh books are sci-fi?

Rebel Seoul and Rogue Heart are the sci-fi books in her catalog.

Final recommendation

If you want one decisive answer, start with The Girl Who Fell Beneath the Sea for a standalone. If you want a series instead, choose either Rebel Seoul for sci-fi or The Floating World for fantasy and read each pair in order.

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