Kaii-san to Ore Volume 3 Releases October 20 with a Newly Drawn Yukionna Story

Kaii-san to Ore Volume 3, officially titled Kaii-san to Ore 《San》, will be published in Japan on October 20, 2026.

Creator Funi Muku says the book will contain a large amount of newly drawn material centered on a young Yukionna who encounters the boy at the heart of the series.

Quick Summary

• Japanese title: 怪異さんと俺 《参》
• Romanized title: Kaii-san to Ore San
• Common designation: Kaii-san to Ore Volume 3
• Official English/global title: not announced
• Format: manga and comic essay
• Volume: Volume 3
• Creator: Funi Muku
• Japanese creator name: ふに・無9
• Publisher: KADOKAWA
• Release date: October 20, 2026
• Price: 1,430 yen including tax
• Base price: 1,300 yen before tax
• Book format: A5
• Page count: 160
• ISBN: 978-4-04-660617-4
• Primary Volume 3 characters: the boy who sees supernatural beings and a Yukionna
• Story focus: the relationship between the Yukionna and the boy
• New content: a substantial amount of newly drawn material
• Themes: friendship, first love, loneliness, supernatural beings, and changing seasons
• Yukionna’s background: she runs away from her snowy mountain to learn about the human world
• Central danger: she begins disappearing as spring approaches
• Key encounter: the kindhearted boy saves her
• Her feelings: she falls in love at first sight
• Physical pre-orders: available
• Digital edition: not listed on the current product page
• Series status: ongoing
• Anime adaptation: not announced
• Official English edition: not announced
• Official Indonesian edition: not announced

Official Announcement and Volume 3 Cover

Volume 3 Centers on the Yukionna

Funi Muku has announced that the third volume will focus on a Yukionna, with extensive new material created for the collected edition.

The young supernatural being comes from a snowy mountain and has little experience with human society. Curiosity about life beyond the mountains leads her to leave her original home.

She imagines meeting humans, exploring their settlements, and perhaps experiencing the kind of romance she has only dreamed about.

Her journey becomes dangerous when winter ends. As the air grows warmer, her body begins losing the power needed to maintain its form.

She is close to disappearing when she meets the boy capable of seeing supernatural beings. His decision to save her becomes the beginning of feelings she has never experienced.

First Love Arrives with Spring

The official synopsis presents the Yukionna as an inexperienced girl who is in love with the idea of love itself.

She does not fully understand human relationships but remains fascinated by affection and closeness, both of which were absent from her isolated mountain life.

The boy becomes the first human to accept her existence without immediately fleeing or treating her solely as something frightening.

That warmth directly contrasts with her nature as a being connected to snow and cold. Love begins to grow at the same moment spring heat threatens her survival.

Volume 3 follows the two characters through spring, summer, autumn, and winter.

Each season may introduce a different problem for the Yukionna, both through the condition of her body and through further encounters with supernatural beings.

The Cover Combines Snow and Quiet Intimacy

The Volume 3 cover uses blue, white, and black to establish a cold yet peaceful atmosphere.

The pale-haired Yukionna rests close to the boy, surrounded by snow, reflected light, and blue circular patterns resembling drifting ice.

Their position is calmer than the dangerous first encounter described in the synopsis. The artwork suggests that she has found a place where she can safely remain.

Funi Muku has not stated whether the scene represents a specific moment from the book or serves as symbolic artwork for their relationship.

The Yukionna’s personal name and the full contents of the newly drawn chapters also remain undisclosed.

A Boy Who Can Hear the Kaii

Kaii-san to Ore follows a boy capable of seeing supernatural beings known as kaii.

Most humans remain unaware of them. Even when their presence is noticed, only a small number of people can hear their voices and understand their feelings.

This ability makes ordinary human relationships difficult for the boy. He spends much of his life alone without friends capable of understanding what he sees.

His meeting with a talking Ichimatsu doll begins an unusual series of friendships with supernatural girls.

Rather than treating each kaii only as a threat, he attempts to learn about her history, loneliness, and personal wishes.

His sincerity gradually causes beings that originally appeared distant or frightening to open their hearts to him.

Each Volume Explores a Different Bond

The first volume establishes the boy’s connection with the supernatural world, beginning with the Ichimatsu doll.

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It was published on December 20, 2024, with more than 50 pages of newly drawn content beyond the episodes that had received attention on social media.

Volume 2 followed on October 14, 2025, and centered on Miko, a bakeneko attempting to ease the loneliness of a boy who had lost both parents.

Because she is not human, Miko believes she cannot truly replace his family. Their reunion after time passes examines a bond that exists without blood relations.

Volume 3 moves toward first love. The Yukionna is no longer seeking only friendship or family, but begins developing romantic feelings for the human who saves her.

The Book Includes Extensive New Material

Funi Muku publishes illustrations and short manga about supernatural girls and a boy through X.

The collected books do more than reproduce those posts without changes. Each edition includes additional scenes that connect its relationships into a more complete story.

For Volume 3, the creator specifically promises a substantial amount of newly drawn Yukionna material.

The exact number of original pages has not been disclosed. KADOKAWA currently lists only the complete 160-page total.

Retailer bonuses, color pages, physical extras, and possible digital bonuses have not been announced.

Further purchase information may arrive as the October release approaches.

Why This Matters

1) The Yukionna is presented as more than a frightening legend

She is curious, inexperienced with human society, and carries a simple wish to understand love.

2) Seasonal change directly affects the story

Spring is not merely scenery. Its warmth threatens the Yukionna’s body, giving the four-season structure a practical emotional role.

3) Every kaii represents a different emotional bond

The Ichimatsu doll introduces friendship, Miko explores family, and the Yukionna brings romance into the series.

4) Existing readers receive additional storytelling

Readers familiar with Funi Muku’s X posts will still find substantial material created specifically for the book.

Manga and Book Information

The important details currently known are:

• Kaii-san to Ore is a manga by Funi Muku
• the creator’s name is read as Funi Muku
• the story follows a boy who can see and hear supernatural beings
• he attempts to befriend kaii that struggle to connect with humans
• Volume 3 is officially titled Kaii-san to Ore 《San》
• it releases on October 20, 2026
• KADOKAWA publishes it as a comic essay
• the official price is 1,430 yen including tax
• the book uses an A5 format
• it contains 160 pages
• its ISBN is 978-4-04-660617-4
• the cover features the Yukionna and the boy
• the Yukionna leaves her mountain because she is curious about human life
• spring causes her body to approach disappearance
• the boy saves her
• she subsequently falls in love at first sight
• their story follows the four seasons
• Funi Muku has created extensive new material
• physical pre-orders are available
• a digital release date is not currently listed
• no anime adaptation has been announced
• English and Indonesian editions have not been announced
• book details are available through the official KADOKAWA page
• the series list is available through the official Kaii-san to Ore page
• creator updates are available through Funi Muku’s official X account

Closing

Kaii-san to Ore Volume 3 brings the boy together with a Yukionna who is only beginning to understand human life and romantic feelings.

The book arrives on October 20, 2026, in a 160-page A5 edition. Complete information about its newly drawn content, retailer bonuses, and digital edition awaits further announcements.