24kumi

K. showcase on December 2. On December 24, the final two members Shin and Yuju were introduced.

In January 2024, members Shin, Ruka, Gaku and Haku performed as backup dancers for ENHYPEN during the 38th Golden Disc Awards. On January 24, 24kumi underwent a dance workshop with Japanese dancer and choreographer Miyoshi Akanen. The group did livestreams called 24kumi Broadcasting Club: Monthly 24th Class every 24th of the month.

They were also active on social media and occasionally posted vlogs to communicate with the fans. 24kumi suddenly went inactive by mid 2024. In early 2025, the group's official SNS accounts were rebranded into "Oen-High", hinting at 24kumi's disbandment.

On February 2, 2025, HYBE Labels Japan Following the disbandment of 24kumi: - All the trainees became contestants on Oen-High. - In episode 6, Shin was eliminated from the competition. - In November 2025, he opened his personal SNS accounts.

Later on November 30, it was announced that he is a debut candidate for the Japanese boy group TAGRIGHT under his birth name Shion Kishinami. On December 28, he was announced as an official member of the group. - During the show's finale, Kyosuke, Yuju, Ruka and Haku were announced to be members of the group aoen, ranking 1st, 2nd, 4th and 5th respectively.

- A public fan voting was held for the final two members of aoen. During a live broadcast of 's show DayDay. on April 23, 2025, Gaku and Reo were announced to be the final members of the group after ranking 1st and 2nd in the voting respectively.

Kaiji ranked 4th in the voting and 9th overall therefore not making it to the final debut lineup. - aoen made their debut on June 11, 2025 with their first single album "The Blue Sun". - In October 2025, Kaiji opened his personal SNS accounts.