Kasane teto

Her Synthesizer V design contains many of the same elements but was updated as a cross between a school uniform and a military uniform, giving it an idol look.[4] Her light gray shirt possesses two sets of sleeves, one long and one short, with her right side having another frilled layer above her first short one. The short sleeves have a red border. Her top has black cuffs with red buckles and two rows of gold buttons on the breast. Around the collar is a nameplate with "0401" written. Her light gray, high-waisted skirt has a black fringed petticoat beneath it, and the same hanging belt as her previous design, though this time it attaches to the red hem of her skirt. Both her shirt and skirt depict a set of five lines in various wavelike patterns, reminiscent of a music staff. Her heeled boots are lace-up and mid-calf length, with laces tied around the back. Her left twin-tail has a white ribbon tied in. Teto's nails are painted scarlet.

According to the TWINDRILL livestream after debut, the team revealed some notes about the production of the design:

Regarding the belt, they were not sure whether to put it inside or outside of her outfit, or if they should include it in place of a tail. Since Teto is over thirty years old, the team wondered if the skirt should be lengthened but it was kept short in the final design to give it a cuter look. The team was torn on the frill colors of the skirt at first. The skirt pattern was meant to resemble a music staff. The design looks like a fife and drum corps uniform. The team wondered about her having knee-high or short boots in addition to the sock colors.[5]