A manga adaptation with illustrations by Kaname Seu was serialized in Media Factory's Monthly Comic Alive magazine between May 2020 and April 2022.

Before the first volume was published, a promotional video was released, where Yūichirō Umehara, Sora Amamiya, Miku Itō, Nao Tōyama, Aoi Yūki, Sumire Uesaka, Ayane Sakura and Tomori Kusunoki played the roles of the members in Lamplight.

[20] During their New York Comic Con 2022 panel, Yen Press announced that they had also licensed the short story collections.

[21] A manga adaptation, illustrated by Kaname Seu, was serialized in Media Factory's Monthly Comic Alive magazine from May 27, 2020 to April 27, 2022.

[50] An anime television series adaptation was announced during the "Fantasia Bunko Online Festival 2022" event on March 13, 2022.

The series is produced by Feel and directed by Keiichiro Kawaguchi, with scripts written by Shinichi Inotsume, character designs handled by Sumie Kinoshita, and music composed by Yoshiaki Fujisawa.

[70] Part I: Ten years after the destructive Great War, the nations of the world decided to turn to espionage rather than open warfare to resolve their conflicts.

As part of this mission, Klaus gathers seven young spy cadets who are struggling in training, including a girl named Lily, into a team codenamed Lamplight.

He explains that he will help train them to prepare for an Impossible Mission in the Galgad Empire, but while he proves to be a master spy, he is actually a poor teacher.

However, Klaus reveals he already saw through Lily's ambush, but he is impressed how she took the initiative to try and improve her situation, which gives him inspiration on how to teach the other students.

The next day, Klaus installs Lily as the team leader for Lamplight and assures them that he won't let any of them die.

Klaus arrives to find the girls asleep, and he remembers a lesson he was taught where a person willing to sleep in front of another is a sign of ultimate trust.

Part I: Some time after the completion of the Impossible Mission, Klaus returns to the mansion from vacation, where he thwarts more attempts by Lamplight to ambush him.

In addition, Grete begins serving tea to him privately in his room and openly flirts with him, leading him to wonder why she has such an interest in him.

Klaus then realizes that Grete disguised herself as him and gave false orders to Lily so he wouldn't pick up any hostile intent.

Still impressed with how Grete was able to come up with such an elaborate plan to trap him in such a short amount of time, Klaus decides to have her and Lamplight's strongest members accompany him on the hunt for Corpse.

Despite this, Klaus picks Lily, Grete, Sibylla, and Sara for the mission and the infiltrate politician Uwe Appel's mansion under the guise of newly hired servants to protect him from Corpse.

During a break, Grete confides in Sibylla that she is actually the daughter of a prestigious political family, and that she gets physically ill when she has to talk to any men besides Klaus.

Part III: Corpse manages to escape into the forest, leaving the girls with no choice but to keep protecting Uwe until he makes his next move.

Olivia then openly becomes suspicious of the girls, warning Uwe how they are acting uncharacteristically calm despite the attempted assassinations.

Matilda admits that she is being chased by debt collectors because her toolbox was stolen and she was tricked into pawning off her passport in an attempt to get it back.

An embarrassed Monika agrees to go with Thea's plan to keep her secret, but warns that somebody will eventually take advantage of Lamplight's kindness.

Part I: White Spider meets with fellow Serpent member Purple Ant in the city of Mitouza in the United States.

White Spider explains that the Tolfa Economic Conference will begin soon, which will attract spies from all over the world, and orders Purple Ant to eliminate them all, including Klaus.

Klaus and Lamplight then arrive in the United States and quickly infiltrate various areas of Mitouza to gather intelligence, though they also learn that foreign spies are being killed.

Part II: Lamplight continues their intelligence gathering, though Klaus warns that numerous foreign spies have been killed so far.

[3] Rebecca Silverman from Anime News Network praised the story as fun and interesting, while criticizing what she felt were authorial stumbles trying to pull everything together.

[76] Demelza from Anime UK News praised the first volume as well, as she felt it was unique compared to most other light novels available in English.

[77] Satoshi Maejima [ja] from The Asahi Shimbun also praised the story, while criticizing the main female protagonist as underdeveloped.