In A Couple of Cuckoos chapter 27, titled "You Never Let Me See You Smile," the ongoing tension in the central love triangle reaches a new level as Nagi and Sachi argue and Sachi struggles to express her desire to spend more time with her brother. Meanwhile, Erika becomes interested in Nagi's interactions with Hiro after witnessing their closeness, setting the stage for an upcoming date at an amusement park.