A Couple of Cuckoos anime revealed the preview trailer for the finale (episodes 23 and 24) on their official Twitter and website. In the first preview (episode 23), they tease a Hiro-centric episode wherein Hiro invites Nagi to a special place. The second preview (episode 24), shows the gang celebrating Yohei Umino’s birthday. Nagi’s parents also shared their relationship with everyone in the past. The finale is scheduled to air on Sunday, October 1 at 1:30 am JST.
The series previously announced that episodes 23 and 24 of the series will be broadcast together, making the season finale of A Couple of Cuckoos an hour-long special. Studios Shin-Ei Animation and SynergySP are collaborating on animating the series. Yoshiyuki Shirahata acts as the director with Hiroaki Akagi as the chief animation director. Yasuhiro Nakanishi is in charge of writing the scripts, Aya Takano is doing the character designs, and Rei Ishizuka on composing the music for the series. Akari Kito plays the role of Erika Amano while Kaito Ishikawa voices Nagi Umino.
The anime is adapted from the manga written by Miki Yoshikawa. It was initially published as a one-shot manga in September 2019, before beginning serialization in Kodansha’s Weekly Shonen Magazine in January 2020. Kodansha is currently publishing the manga in English with 9 volumes in circulation and describes the plot as:
16-year-old super-studier Nagi Umino, second-year student at the Meguro River Academy high school, was switched at birth. On his way to a dinner to meet his birth parents, he accidentally meets the brash, outspoken, Erika Amano, who is determined to make Nagi her fake boyfriend as she never wants to actually marry. But once Nagi makes it to dinner, he finds his parents have decided to resolve the hospital switch by conveniently having him marry the daughter his birth parents raised…who turns out to be none other than Erika herself!
Source: A Couple of Cuckoos Official Website
© Miki Yoshikawa / Kodansha / A Couple of Cuckoos Production Committee
