Ms. Isshiki Wants to Know About Love

• Name — Isshiki-san Wants to Know About Love • Ja Kanji — 一式さんは恋を知りたい。 • Ja Romaji — Isshiki-san wa Koi o Shiritai • Genre — Romantic comedy

• Type — manga • Title — Rinna Keibu wa Kokyū ga Dekinai • Author — Ayune Araragi • Publisher — Ichijinsha • Imprint — Rex Comics • Magazine — Monthly Comic Rex • First — October 27, 2016 • Last — December 27, 2017 • Volumes — 3

• Type — manga • Author — Ayune Araragi • Publisher — Kadokawa Shoten • Imprint — Kadokawa Comics A • Magazine — Monthly Shōnen Ace • First — June 26, 2020 • Volumes — 10

• Type — tv series • Director — Kazuya Komai • Writer — Deko Akao • Music — Michiru • Studio — Sakura Create • First — January 2027 • Last — scheduled

• Portal — yes Isshiki-san Wants to Know About Love is a Japanese manga series written and illustrated by Ayune Araragi. It was originally serialized under the title Rinna Keibu wa Kokyū ga Dekinai in Ichijinsha's Monthly Comic Rex magazine between October 2016 and December 2017, with its chapters being collected into three volumes. It was then relaunched in Kadokawa Shoten's Monthly Shōnen Ace magazine in June 2020, with its chapters collected into ten volumes as of May 2026. An anime television series adaptation produced by Sakura Create is set to premiere in January 2027.

The series follows Rinna Miliford Isshiki, a genius police inspector who is nicknamed "Steel-Faced Rinna". Known for her serious demeanor, recently she had seen herself feeling flustered when she is around police detective Meishi Rokutanda. Although she aims to continue showing her steel-faced facade, she cannot help but fall for Meishi's kindness. Wanting to get over her conflicted feelings, she decides to accept Meishi's offer of them becoming engaged in a fake relationship, thought it is unknown if Meishi feels the same way for her.

• Rinna Miliford Isshiki • Riko Akechi • A police inspector known for her serious demeanor and high intelligence. She became a police inspector at the age of 17 thanks to her brilliance, having graduated at the top of the class. She is nicknamed Steel-Faced Rinna for her personality. She does not want to show her feelings to others, but finds difficulty in doing so after developing feelings for Meishi. • In Rinna Keibu wa Kokyū ga Dekinai, her name is Rinna Miliford, a police inspector working for the London police force. • Meishi Rokutanda • Shūichirō Umeda • A police detective and one of Rinna's subordinates. He becomes the object of Rinna's affection and offers to have a fake relationship with her to help her sort out her feelings, though whether he reciprocates her feelings or not is unclear. • In Rinna Keibu wa Kokyū ga Dekinai, his name is Meishi Rīrando, a detective working in London.

The series was originally serialized under the title Rinna Keibu wa Kokyū ga Dekinai in Ichijinsha's Monthly Comic Rex magazine between October 27, 2016, and December 27, 2017. The series featured similar characters, but was set in London instead of Japan. The series was compiled into three tankōbon volumes between April 27, 2017, and January 27, 2018. Ayune Araragi relaunched the series in Kadokawa Shoten's Monthly Shōnen Ace magazine on June 26, 2020. The first tankōbon volume was released on December 25, 2020; ten volumes have been released as of May 2026. In March 2026, Yen Press announced that they had licensed the series for English publication, with the first volume set to release in September later in the year.

An anime television series adaptation was announced on October 17, 2025. It will be produced by Sakura Create and directed by Kazuya Komai, with series composition handled by Deko Akao, characters designed by Shōhei Hamaguchi, and music composed by Michiru. It is set to premiere in January 2027.