Yui Hatano, contracted with Leten in 2017, has been collaborating with Leten in depth to participate in the internal structural design of Leten products.

Takizawa Rola, contracted with Leten in 2017, has been collaborating with Leten in depth to participate in the internal structural design of Leten products.

Amami Tsubasa, contracted with Leten in 2017, has been collaborating with Leten in depth to participate in the internal structural design of Leten products.

Yuu Asakura, contracted with Leten in 2017, has been collaborating with Leten in depth to participate in the internal structural design of Leten products.

Takahashi son, contracted with Leten in May 2019, has been collaborating with Leten in depth to participate in the internal structural design of Leten products.