Sachi Akamatsu

           The daughter of the Ultimate Pianist, Kaede Akamatsu, and Miu Iruma, the Ultimate Inventor. She has inherited her love for both music and machinery from both of her parents wanting to combine the both of them since a young age, taking apart the little electronic toy pianos and making them into functional fully automatic instruments. Learning how to do these things from watching her mothers at work.
            During her time in high school she shared a class with the Ultimate EMT, and gains slight romantic feelings for the shy medic. She soon confessed to her, and Yoshicho, not sure what to do, accepts the feelings and enters a relationship with her, but it ends up being quite strained since Sachi wants to be affectionate and comforting with Yoshi, but the small medic refuses to open up to her, causing strain on the relationship. Other then that, she is best friends with her younger sister, Kaiya Amami, bonding over their shared love of music and even trade works with each other as gifts.

Killing Prank
Sachi helped Akeno in setting up the Killing Prank Game, helping make all the contraptions and set ups in the building. But she is killed as one of the victims by Shou alongside her sister Kaiya. Her "death" was a blow to the head from being thrown and hitting something.