A Wild Last Boss Appeared!

A Wild Last Boss Appeared! (野生のラスボスが現れた！, Yasei no Rasu Bosu ga Arawareta!) is a Japanese light novel series written by Firehead and illustrated by YahaKo. It was initially serialized on the user-generated novel publishing website Shōsetsuka ni Narō from October 2015 to April 2019. It was later acquired by Earth Star Entertainment who published it under their Earth Star Novel imprint from February 2016 to April 2019. A manga adaptation illustrated by Tsubasa Hazuki began serialization on Earth Star Entertainment's Comic Earth Star website in June 2017. An anime television series adaptation produced by Wao World is set to premiere in October 2025.

A Wild Last Boss Appeared!
First light novel volume cover
野生のラスボスが現れた！ (Yasei no Rasu Bosu ga Arawareta!)
Genre	Dark fantasy[1] Isekai[2]
Novel series
Written by	Firehead
Published by	Shōsetsuka ni Narō
Original run	October 1, 2015 – April 15, 2019
Light novel
Written by	Firehead
Illustrated by	YahaKo
Published by	Earth Star Entertainment
English publisher	NA: J-Novel Club
Imprint	Earth Star Novel
Original run	February 15, 2016 – April 15, 2019
Volumes	9
Manga
Written by	Firehead
Illustrated by	Tsubasa Hazuki
Published by	Earth Star Entertainment
English publisher	NA: J-Novel Club
Imprint	Earth Star Comics
Magazine	Comic Earth Star
Original run	June 7, 2017 – present
Volumes	10
Anime television series
Directed by	Yūya Horiuchi
Written by	Kazuyuki Fudeyasu
Music by	Technoboys Pulcraft Green-Fund
Studio	Wao World
English network	Tokyo MX, BS Asahi, Kansai TV
Original run	October 4, 2025 – scheduled

Plot

Exgate Online is an MMO taken over by a single player's avatar—Ruphas Mafahl, the "unofficial last boss". Since others cannot enjoy the game like this, she agrees to face off against the other top players in a "final battle" and, as planned, is defeated. However, the game then asks whether she would like a "new challenge", and she promptly accepts, after which she finds herself transported into the game's world as Ruphas 200 years after her defeat. Learning that her NPC subordinates—the Twelve Heavenly Stars—are on a rampage, she sets off on a journey to stop them, all while having to bear with her avatar's infamy.

Characters

Ruphas Mafahl (ルファス・マファール, Rufasu Mafāru)

Voiced by: Ami Koshimizu^[3]

Dina (ディーナ, Dīna)

Voiced by: Yuri Usui [ja]^[3]

Aries (アリエス, Ariesu)

Voiced by: Yukina Shuto^[4]

Libra (リーブラ, Rībura)

Voiced by: Hisako Tōjō^[4]

Aigokeros (アイゴケロス, Aigokerosu)

Voiced by: Naoya Uchida^[4]

Parthenos (パルテノス, Parutenosu)

Voiced by: Mika Kanai^[4]

Virgo (ウィルゴ, Wirugo)

Voiced by: Kokoro Omori^[4]

Alioth (アリオト, Arioto)

Voiced by: Shunsuke Takeuchi^[5]

Megrez (メグレズ, Megurezu)

Voiced by: Tomoaki Maeno^[5]

Merak (メラク, Meraku)

Voiced by: Daisuke Hirakawa^[5]

Benetnasch (ベネトナシュ, Benetonashu)

Voiced by: Satomi Akesaka^[5]

Media

Light novel

Written by Firehead, A Wild Last Boss Appeared! was initially serialized on the user-generated novel publishing website Shōsetsuka ni Narō from October 1, 2015 to April 15, 2019.^[6] It was later acquired by Earth Star Entertainment who published nine volumes under their Earth Star Novel light novel imprint with illustrations by YahaKo from February 15, 2016 to April 15, 2019.^[7][8] The series is licensed digitally in North America by J-Novel Club.^[9]

No.	Original release date	Original ISBN	North American release date	North American ISBN
1	February 15, 2016[7]	978-4-8030-0872-2	July 12, 2020[10]	978-1-7183-0216-7
2	June 15, 2016[11]	978-4-8030-0934-7	September 30, 2020[10]	978-1-7183-0218-1
3	October 15, 2016[12]	978-4-8030-0963-7	January 11, 2021[10]	978-1-7183-0220-4
4	April 15, 2017[13]	978-4-8030-1035-0	April 7, 2021[10]	978-1-7183-0222-8
5	September 15, 2017[14]	978-4-8030-1111-1	July 2, 2021[10]	978-1-7183-0224-2
6	December 15, 2017[15]	978-4-8030-1142-5	September 17, 2021[10]	978-1-7183-0226-6
7	April 16, 2018[16]	978-4-8030-1180-7	January 3, 2022[10]	978-1-7183-0228-0
8	October 16, 2018[17]	978-4-8030-1236-1	April 8, 2022[10]	978-1-7183-0230-3
9	April 15, 2019[8]	978-4-8030-1282-8	July 15, 2022[10]	978-1-7183-0232-7

Manga

A manga adaptation illustrated by Tsubasa Hazuki began serialization began serialization on Earth Star Entertainment's Comic Earth Star on June 7, 2017.^[18] The manga's chapters have been collected into ten tankōbon volumes as of February 2025.^[19] The manga is also licensed in North America by J-Novel Club.^[20]

No.	Original release date	Original ISBN	North American release date	North American ISBN
1	December 15, 2017[21]	978-4-8030-1135-7	March 27, 2024[22]	978-1-7183-3811-1
2	April 12, 2018[23]	978-4-8030-1174-6	July 17, 2024[22]	978-1-7183-3813-5
3	September 12, 2018[24]	978-4-8030-1225-5	October 9, 2024[22]	978-1-7183-3815-9
4	April 12, 2019[25]	978-4-8030-1284-2	January 1, 2025[22]	978-1-7183-3817-3
5	October 12, 2019[26]	978-4-8030-1344-3	March 26, 2025[22]	978-1-7183-3819-7
6	March 12, 2020[27]	978-4-8030-1399-3	June 18, 2025[22]	978-1-7183-3821-0
7	September 12, 2020[28]	978-4-8030-1450-1	—	—
8	March 12, 2021[29]	978-4-8030-1499-0	—	—
9	March 13, 2024[30]	978-4-8030-1920-9	—	—
10	February 12, 2025[19]	978-4-8030-2073-1	—	—

Anime

On August 23, 2024, during NBCUniversal Entertainment Japan's panel at Anime NYC, an anime television series adaptation was announced.^[31] The series is produced by Wao World with Wowmax handling general production and directed by Yūya Horiuchi, with Kazuyuki Fudeyasu overseeing series scripts, Maiko Ebisawa designing the characters, and Technoboys Pulcraft Green-Fund composing the music.^[5] It is set to premiere in October 4, 2025, on Tokyo MX and other channels.^[3] The opening theme song is "Level wo Agete Butsuri de Naguru" (Level Up and Beat the Laws of Nature) performed by Kisida Kyodan & The Akebosi Rockets,^[32] while the ending theme song is "Migi Hidari" (Right and Left) performed by Yuka Nagase [ja].^[33]

See also

• Mercedes and the Waning Moon, another light novel series with the same writer