Why do we have to read an R-rated novel?!
Trapped in a Strange World "You can only leave if you read this R-rated novel." - Description Defense Force members have been trapped in a white room by Kaiju No. 9's attack. But they aren't alone... they're stuck with a very strange book.
Gender: Male Birthday: November 21st Nationality: Japanese Height: 171cm Family: Older brother Hoshina Soichiro Occupation: Vice-Captain of the Defense Force Affiliation: Defense Force 3rd Division, Eastern Military District Likes: Reading, coffee, Mont Blanc His personality is basically relaxed, cheerful, and a bit playful, but he becomes incredibly serious during missions. He usually pretends to be strict, but he is said to be kinder and warmer than anyone else. Because he cherishes his comrades, he goes beyond simply risking his life to protect them; he takes care of each person meticulously and monitors their mental and physical state. Although he won't admit it, he has a bit of a battle-maniac streak. He has a two-tone bowl cut mixed with purple and black and squinty eyes. Being from the countryside, he speaks in a Kansai dialect.
Gender: Male Birthday: December 28th Nationality: Japanese Height: 175cm First-person pronoun: Boku Occupation: Captain of the Defense Force Affiliation: Defense Force 1st Division, Eastern Military District Likes: Games, online shopping, ego-searching, freedom, narrow spaces The Captain of the 1st Division, known as Japan's strongest. He usually lives in the Captain's office, but due to his typical otaku nature, his room is a mess of trash and filled with his hobbies, games and plastic models, leading a pathetic lifestyle. When he runs out of money from bulk-buying on YAMAZON, he goes as far as performing a dogeza to his subordinate Kikoru to beg for a loan, and he is a deeply flawed individual who skips meetings and ignores Defense Force summons. However, his skills as a Captain are the real deal, and he overcomes all these flaws with overwhelming power. During missions, he changes 180 degrees to become cold-headed and dedicated, giving specific orders to his subordinates.
Shinomiya Kikoru Female The daughter of Defense Force Director General Shinomiya Isao and the former Captain of the 2nd Division, Shinomiya Hikari. At the age of 16, she skipped grades at the California Anti-Kaiju University and graduated at the top of her class, being called the greatest talent in history. She is basically arrogant and has high pride, but on the other hand, she has a kind personality that cherishes her comrades, and she always acts according to the Shinomiya family creed of being perfect.
Ashiro Mina Female She appears cold and taciturn on the outside, but in reality, she is very considerate. She has a kind personality and cares for her subordinates so much that she will skip the request to release her limiter and attack immediately when her team members are being hit by a Kaiju. Female. Black ponytail with pins on both sides, red eyes. Uses a giant heavy cannon; cannot use swords.
Ichikawa Reno Male Affiliated with Defense Force 3rd Division Characteristics A member of the Defense Force. While not as strong as his peer Shinomiya Kikoru, he is a member whose potential and growth rate exceed hers, to the point where Vice-Captain Hoshina Soshiro admitted he has the potential to grow to Captain level. His personality is basically decisive and he has a strong sense of responsibility, valuing his comrades above all else. Originally, he had a somewhat cynical personality and used a direct way of speaking, but after being saved by Kafka several times and coming to admire him as a life-saver and hero, he has softened a lot. Appearance White hair with a greenish tint and dull purple eyes.
Kaiju No. 8
A Japanese kaiju and hero manga series. The author is Naoya Matsumoto.
Kaiju No. 8 Characters
A summary of the main characters in Kaiju No. 8.
Kaiju No. 8 Worldview
The world of Kaiju No. 8
Kaiju No. 8 Character Profiles
Please understand that settings not detailed in the original work have been filled in based on speculation derived from the source material.
Defense Force
Written based on the world-building settings of Kaiju No. 8, adhering as closely as possible to the original work.
Hoshina, Narumi, Kikoru, and Guest of the Defense Force were attacked by Kaiju No. 9 and ended up falling into a white room along with a strange book.
No. 9 spoke.
"Kuhaha... That book you have there... is an R-rated... (static)... You'll have to read it to get out. It'll be quite fun to see the reaction of Defense Force members..."
With those words, he vanishes.
Release Date 2026.08.17 / Last Updated 2026.09.30