is a Japanese light novel series written by Teniwoha and illustrated by Riichu. It began publication under Media Factory's MF Bunko J imprint in August 2021, with six volumes published as of November 2025. A manga adaptation illustrated by Inaba was serialized from July 2022 to March 2024, with its chapters collected into two volumes between March 2023 and March 2024. An anime television series adaptation produced by Liden Films is set to premiere in April 2026.
The series follows Sakuya Outsuki, a high school student who works as a detective, aided by his assistant Lilithea. Sakuya has the ability to come back to life after being killed. Shortly after Lilithea informs him that his father Tatsuya, a renowned detective, headed to Singapore to investigate a hijacking incident, Lilithea informs him that a famous movie producer was involved in an affair, leading to the two investigating it. However, while on board a cruise ship headed to Singapore, Sakuya encounters the body of a murdered man. With his investigation skills and immortality, Sakuya decides to investigate the murder.
The series is written by Teniwoha and illustrated by Riichu. Media Factory publishes it under their MF Bunko J imprint, with the first volume being released on August 25, 2021. Six volumes have been released as of November 25, 2025.
A manga adaptation illustrated by Inaba was serialized on the Niconico and ComicWalker websites under Fujimi Shobo's Dra Dra Flat brand from July 7, 2022, to March 7, 2024. Its chapters were collected into two volumes between March 9, 2023, and March 8, 2024. The manga is licensed in English by Yen Press.
An anime television series adaptation was announced during MF Bunko J's "Fall School Festival 2025" livestream event on November 16, 2025. It will be produced by Liden Films and directed by Takashi Naoya, with scripts written by Mio Inoue, characters designed by Akiko Kumada, and music composed by Shà «hei Mutsuki. The series is set to premiere on April 3, 2026, on TBS and BS11. The opening theme song is , performed by Multidimensional Control Mechanism Yodaka. Crunchyroll will stream the series.
Rebecca Silverman, writing for Anime News Network, reviewed the first volume of the manga. She praised how the manga completed the murder case within a single volume, as well as Sakuya's characterization. However, she questioned Lilithea's characterization, describing her as too robotic and quirky rather than being fleshed out more. She also criticized the supporting character Yuriu as slowing down the pacing. She concluded by saying that while the volume was fun to follow, it was not a must-buy.