Manga creator Hakuri revealed on Wednesday that their Seikai no Tantei manga spinoff will end with the fourth volume although Hakuri did not reveal a release date for that volume Hakuri joked that they initially planned the manga with a three-volume structure in mind The manga is a prequel to Hakuri's One Room of Happiness (SACHIiro no One Room) manga, and features the detective character Hijiri Matsubase as the protagonist. Square Enix published the first volume of the manga in September 2019 The manga's third volume will ship on May 21 Source: Hakuri's Twitter account Please view the main text area of the page by skipping the main menu. The page may not be displayed properly if the JavaScript is deactivated on your browser Amazon is listing the 11th compiled book volume of Hakuri's One Room of Happiness (SACHIiro no One Room) manga as the final volume The story centers on a girl and her kidnapper The kidnapper removes the girl from the troubles in her former life and provides her with a taste of happiness The girl starts to enjoy living with her kidnapper Hakuri wrote a spinoff of the manga titled Seikai no Tantei, which is a prequel to the original manga and features the detective character Hijiri Matsubase as the protagonist. Square Enix published the first volume of the spinoff manga in September 2019. The manga ended in its fourth volume Source: Amazon Japanese version