Kirako Haruno/Synopsis

Armed Detective Agency vs. Port Mafia Arc
In the anime, Haruno and other girls were observing from the side while a bomber was holding Naomi Tanizaki as a hostage. As the bombing incident is revealed to be a test for Atsushi Nakajima, Haruno later serves tea to Agency president Yukichi Fukuzawa.

The Guild Arc
As the Agency, Port Mafia, and the Guild engage in a three-way war, Haruno and Naomi retreat into hiding in a safehouse. Haruno dotes upon her cat, Mii-chan, on her laptop. Naomi later catches her, compelling her to quickly return to work. They learn about a cruiser explosion near the Yokohama commercial port, which Haruno expounds to be owned by a private company. Naomi thinks that the company might be the Guild's and that the explosion might have been caused by someone from the mafia. Haruno then contacts and warns Fukuzawa, thinking that the Agency might be in trouble next.

Haruno and Naomi are soon contacted to evacuate as soon as possible, after discovering that two Guild members are after them. As Haruno frantically tries to gather her possessions, including her bottles of wine (which she actually downed in one sitting the previous night) and her curling iron (which she threw out the window while intoxicated), Naomi reckons they leave at once, confident that the Agency and her brother shall soon come to their rescue.

Naomi notices the Guild members near their lodging, so Haruno recommends that they use her car to escape. As per Naomi's suggestion from what she learned from Osamu Dazai, they escape through the staff passage and utilize a staff vehicle instead of exiting through the parking lot. Using the keys Naomi swiped from a waitress, she tosses them to Haruno to drive, upon which the latter remarks how Naomi would be quite a capable agent than her brother, more so if she were an ability user.

Haruno drives, and they manage to get away from the location. However, their escape is soon thwarted when Steinbeck uses his grapevines to trap their vehicle. Steinbeck then greets the clerks and explains how his ability works. Afterwards, he tells them his motive of working for the Guild, stating how he would gladly perform the Guild's undertakings – no matter how much they view it as "evil" – as long as it helps aid his family financially.

As Steinbeck crushes their vehicle, Lovecraft notices how snow is falling at such a strange time. Doppo Kunikida later emerges from behind him and shoots the two Guild members, causing Steinbeck to loosen his grapevines' grip on the clerks' vehicle. Tanizaki then breaks Haruno and Naomi out of the vehicle and asks them to flee to a passenger train at the foot of the hill.

During their escape, Haruno gets captured by Steinbeck's grapevines once more, after which Naomi gets caught as well. Eventually, after Tanizaki devises a way to crash a truck onto Steinbeck and Lovecraft, the grapevines collapse and allow Naomi and Haruno to chase the passenger train, where they successfully get onboard.

Inside, Naomi assures Haruno that they are safe at the moment, upon which they soon encounter a mysterious child. As the train arrives, they introduce Atsushi to their acquaintance, who bumps themself on Atsushi and pulls up their sleeve to reveal various razor blades on their arm. Unbeknownst to him, Atsushi soon gets immersed in a curse, which turns out to be Q's ability. Seeing his companions turn hostile against him, Atsushi defends himself by using his tiger strength; he attacks Haruno after strangling him and later chokes Naomi in the process.

Dazai arrives and asks Atsushi to come to his senses. He realizes that he was the one cursed after all rather than the other way around, noticing the traumatized clerks from his attacks. As he experiences a breakdown, Dazai slaps him out of it and lectures him not to pity himself, lest his life shall be an unceasing nightmare. Dazai then announces that they must move onward with their counterattack.