Tune In to the Midnight Heart

Yamabuki Arisu is in search of a girl he only knows by her voice.

Arisu devises training regimens to elevate the broadcast club members' skills, but singer Rikka challenges his assumptions about her talent during a school performance, leading to mutual respect after he admits his errors. Meanwhile, he discovers voice actress Nene secretly honing her craft with a romance manga and aids her by role-playing scenes to prepare for an audition. Though she doesn't land the role, Nene's growth sparks a shy moment of gratitude toward Arisu.

The club girls secretly follow Arisu and learn of his part-time jobs funding their activities, prompting VTuber Iko to confide in him about her career plateau. Arisu collaborates with her to revamp her virtual model for better emotional expression, helping her shine in a livestream by drawing out her authentic reactions. Overwhelmed by the positive fan response, Iko struggles to show her appreciation to Arisu without blushing.

Struggling with her dual roles as student council vice president and club member, Shinobu shares her desire for peer respect and inferiority feelings with Arisu, who encourages her to seek support. He assists her tirelessly, inspiring Shinobu to lead a creative event at the sports festival where students share anonymous confessions via string phones. The plan gains momentum with the arrival of their quirky advisor, Lemon, who helps navigate school restrictions.

Advisor Lemon initially rejects the club's festival idea but relents after Shinobu appeals to her self-interest, aiding them in promoting it while distracting a strict teacher. Dressed in cosplay, the members broadcast heartfelt confessions, fostering excitement and subtle apologies among the girls toward Arisu. A poignant message echoes Apollo's past betrayal, leading to an anonymous invitation for Arisu to uncover her identity in the broadcast room.

Celebrating their event's triumph at Lemon's place, the girls leave Arisu resting, but misunderstandings arise when Nene spots Iko close to him, sparking awkward talks about their feelings. Hiding together, they overhear each other's vulnerabilities, including Rikka's songwriting doubts, before uniting for cake and games. Reflecting on the day's fun, Arisu ponders Apollo's whispered words and his evolving role in guiding the club's dreams.

Arisu discusses Rikka's cover-song choices with her friend Aiko, learning of Rikka's fear of judgment for her originals, and arranges a private club concert to boost her confidence. Impressed by her passionate performance, the group bonds further during a mall outing and karaoke session. Noticing familiar traits linking the girls to Apollo, Arisu questions them about a shared song, but their confusion leaves the mystery unresolved.