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In/Spectre Series

Chashiba Katase
In/Spectre 21 by Chashiba Katase
Available on (06-24-25)

In/Spectre 21

Book 21
Paperback $10.99

In/Spectre Series : Titles in Order

Book 21
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

Both touched by spirits called yokai, Kotoko and Kuro have gained unique superhuman powers. But to gain her powers Kotoko has given up an eye and a leg, and Kuro’s personal life is in shambles. So when Kotoko suggests they team up to deal with renegades from the spirit world, Kuro doesn’t have many other choices, but Kotoko might just have a few ulterior motives…
Book 20
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

Both touched by spirits called yokai, Kotoko and Kuro have gained unique superhuman powers. But to gain her powers Kotoko has given up an eye and a leg, and Kuro’s personal life is in shambles. So when Kotoko suggests they team up to deal with renegades from the spirit world, Kuro doesn’t have many other choices, but Kotoko might just have a few ulterior motives…
Book 19
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

The AI Phenomenon
Kotoko’s nemesis Rikka is back, and it’s a battle between artificial intelligence and the Goddess of Wisdom. Rikka develops Mecha Kotoko: an advanced technological machine programmed to mimic yōkai supernatural powers. The doppelganger outrages Kotoko, but fools the real yōkai. Up against a seemingly all-knowing artificial version of herself, can Kotoko still emerge as the superior sleuth? A plethora of mysteries awaits in this collection of suspenseful short stories!
Book 18
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

Kotoko delves into a historic Edo era mystery when a high school friend consults her about his family’s possible connection to yôkai. According to legend, a samurai named Shirokura Hanbei battles and slays a yuki-onna in the mountains. Hanbei is later suddenly killed under eerie circumstances, and there are two suspects: himself, or the yuki-onna. Confronted between the choice to tell the truth or to lie, how will Kotoko present the evidence? The spine-chilling “To Slay a Snow Woman” mystery continues…
Book 17
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

Mysterious Chills
The case of the grisly giraffe is f inally closed. Rikka emerges victorious, but will Kotoko’s defeat truly change where Kurô’s heart lies? Meanwhile, a high school friend seeks Kotoko’s expertise to resolve a centuries-old family enigma involving their sword-fighting legacy—and an eerie snow woman. Can Kotoko cut through history—and ghosts of the past—to solve a mystery of generations?
Book 16
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+

A DESPERATE COUNTERATTACK
 
Kotoko teeters on the edge of defeat after having unearthed Rikka’s plan to make the spectres lose faith in her as their Goddess of Wisdom, but there may still be time to salvage the situation. It all hinges on whether or not she can craft the perfect lie to deter any further investigation of the murder in the mountains and succeed in pacifying the vengeful giraffe spirit! Meanwhile, it seems like Rikka has no intention of disappearing again, so what could she be scheming now…?
Book 15
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+

THE KIRIN’S CURSE

A deadly incident in the mountains claims the lives of three victims and leaves one fighting for his life. As Kotoko and Kurô prepare to investigate the involvement of a vengeful giraffe spirit, who should they find at the scene but the elusive Rikka Sakuragawa! Though the trio agree to cooperate on the case, Kotoko can’t help but wonder what Rikka may have in store…
Book 14
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+

A Troublesome Enemy
 
Kotoko’s recollection of a case she solved with Rikka demonstrates how capable they both are, and how difficult of a match it would be should they find themselves on opposing sides. In the present day, Kurô begrudgingly assists Kotoko in her duties of mediating and investigating spectre-related incidents. One such case involves the resentful ghost of a giraffe, and a very familiar face…
Book 13
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+

DOWN MEMORY LANE
To fulfill the Yuki-Onna’s request of saving Masayuki, Kotoko pulls out all the stops to teach the misanthrope a lesson he’ll value forever. The case’s conclusion allows Kotoko and Kurô to return to their routines, but memories of Rikka upset their daily calm. The Goddess of Wisdom reminisces of the time she and Rikka collaborated on a murder mystery, one involving a perpetrator who wanted to ensure his crime was seen…
Book 12
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 16+

ANY LAST WORDS?

As Rikka continues her solitary journey, she makes the acquaintance of one of Kotoko’s high school friends, who reminisces fondly of their days in the Mystery Appreciation Club theorizing about dying messages. Meanwhile, a snow demoness has a request for Kotoko, hoping the revered Goddess of Wisdom can find a way to exonerate her human friend of some very serious charges…
Book 11
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

A SUPERNATURAL COLD CASE

Twenty-three years ago, Sumi Otonashi was killed in a mugging gone wrong. Or was she? Out of nowhere, her husband Gôichi reveals to his heirs that he killed her–and challenges them to figure out how. But can they reach a plausible explanation without knowing he contracted a spectre to do the deed? And what will their own buried secrets bring to light? Kotoko will have to judge the heirs’ solutions, and lead them to the right answer…
Book 10
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

RIKKA RETURNS

It’s been nearly a year, and Kotoko has yet to find Rikka Sakuragawa. Little does she know that Rikka has recently moved into a nice little apartment that came at a very affordable price…because it’s thought to be cursed! What is causing the series of suicides in her new home? And can Kotoko catch her before she goes on the run again?
Book 9
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

A BATTLE OF WITS

Even the mysterious Kotoko Iwanaga was a high school student once, but could a girl like her ever fit in with regular teenagers? There is one student who thinks she would be a great addition to his club, but can he possibly convince the lone wolf to become a member of an organization? Learn how Manabu Amachi manipulated Kotoko into joining the mystery appreciation club!
Book 8
A fantasy/mystery series with a unique Japanese flavor perfect for fans of Noragami: Stray God and Tokyo Ghoul.

Ages 13+

WHEN YOU WISH UPON A STAR

Totomizu was a flourishing little seaside tourist town until suddenly, thousands of dead fish started washing up on shore. No one knows what’s causing it–no one, that is, but the spectres. They say a strange wooden doll is behind this unnatural phenomenon. Can Kotoko solve the mystery and save the town?
Book 7
The new mystery thriller with a romantic edge from the creator of Blast of Tempest, and The Record of a Fallen Vampire! 

Both touched by spirits called yokai, Kotoko and Kuro have gained unique superhuman powers. But to gain her powers Kotoko has given up an eye and a leg, and Kuro’s personal life is in shambles. So when Kotoko suggests they team up to deal with renegades from the spirit world, Kuro doesn’t have many other choices, but Kotoko might just have a few ulterior motives…

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