GEMN (Kitani Tatsuya x Nakajima Kento)
Illustration: WhyTrend

What happened

GEMN, a two-person music unit formed by singer-songwriter Kitani Tatsuya and Nakajima Kento (a former member of the idol group Sexy Zone), reunited on Kitani Tatsuya's All Night Nippon 0, a Japanese late-night radio program. In the early hours of June 2, 2026 (JST), Nakajima appeared as a guest during the show's final special week, and the pair performed a surprise duet cover of 'Seishun Amigo,' a hugely popular 2005 Japanese pop song.

During the broadcast, the two reflected on the lyrics, with one of them saying the words felt like they were about the duo itself. They also teased performing it live someday "with choreography."

Why it is trending now

The reunion landed during an emotional moment: the radio show is set to end its run on June 30, 2026, and this was its last special week. Having Nakajima join as essentially the farewell guest gave the broadcast extra weight for fans. GEMN debuted in 2024 with 'Fatal,' the opening theme for Season 2 of the hit anime 'Oshi no Ko.' The fact that fans still bring such intense devotion to a unit best known for that one breakout song made the rare on-air reunion feel like a major event.

How fans reacted

On X (formerly Twitter), the show's hashtag hit number one and GEMN-related keywords swept the trending list, with one user marveling that more than half of the top trends were GEMN-related. The 'Seishun Amigo' duet drew tearful, celebratory posts, and many fans wrote that they hoped the duo's radio segment would return even after the show ends.

What to watch next:

With the radio program ending June 30, 2026, attention turns to whether GEMN will follow through on the on-air tease of performing 'Seishun Amigo' live with choreography, and whether the pair will continue activity as a unit beyond their breakout 'Oshi no Ko' theme.