Also known as: PythagorasTrio, ピタゴラストリオ
Pythagoras Trio is a 3-person sub-unit consisting of Nikaido Yamato, Izumi Mitsuki, and Rokuya Nagi from IDOLiSH7 (Unit).
During the joint practice portion of the Main Story between IDOLiSH7 (Unit) and TRIGGER (Idolish7) (around Part 2 - Chapter 9) Yaotome Gaku from TRIGGER (Idolish7) is added to the group for this period.
Pythagoras Trio's unit name comes from the Pythagorean Tuning, which is made up of sharps, flats, and naturals, which are Nikaido Yamato (Sharp), Izumi Mitsuki (Flat), and Rokuya Nagi (Natural) respective musical symbols.