Episode 12 of "Hoshikuzu Telepath" concludes the series with a focus on friendship, personal growth, and future ambitions. The episode begins with Yu, Matataki, and Haruno visiting Umika at her home, where they initially have a misunderstanding with Umika's sister, who mistakes them for delinquents. After clearing up the misunderstanding, they spend time with Umika as she rests in bed. Haruno and Matataki help with cooking, while Yu keeps Umika company.

Umika's sister falls asleep, exhausted from the aquarium. Matataki takes care of her while Haruno and Yu cook. In a dream sequence, Umika finds herself in a desert, watching as Haruno and Matataki apathetically touch Yu's forehead. She wakes up to find Yu beside her, whispering a request.

Yu, unsettled by Umika's request for intimate forehead apathy, returns downstairs and explains to Haruno and Matataki that she no longer has the energy for forehead apathy. Umika's sister wakes up and rushes to check on Umika, only to find everyone peacefully asleep.

The scene shifts to the lighthouse, where the girls discuss their future plans. Umika has recovered from her illness, but they notice Yu behaving unusually. Yu explains that her forehead telepathy powers are overactive. The conversation turns to their goals, with Umika emphasizing that they must become a full-fledged club and earn money for their rocket projects. They brainstorm ways to raise funds and improve their skills.

Umika is determined to enhance her leadership abilities and public speaking skills. Haruno expresses her desire to support Umika, though she is unsure of her own goals. They agree to compile their ideas and develop a strategy for their future activities.

At school, Umika practices her public speaking while the group watches a news report about Kei's team's success. This motivates them to further hone their rocket-building skills to compete in the next championship.

The episode ends with Umika trying to pique a classmate's interest in rocketry, followed by a scene at the lighthouse where Kinashi texts Umika, expressing his fascination with the sport. Haruno and Matataki leave, and Umika returns to the lighthouse, where she finds Yu singing on the roof. Umika offers Yu her version of forehead apathy, and they reflect on their time together. The season concludes with a montage of the people involved in the story and a touching moment between Yu and Umika.