Heart no Shindenzu

 (ハートの心電図) is currently a five-member Japanese idol group originally formed with four members on April 1, 2021.

They were originally set to debut on May 6, 2021 @TSUTAYA O-EAST, but it was postponed to August 19, 2021 @Shinjuku ReNY.

Members

 * Hoshi Tsubaki (星つばき; )
 * Nemuri Nen (眠裏ねん; )
 * Egami Nana (廻神なな; )
 * Minase Eri (南瀬絵梨; )
 * Momose Mari (桃瀬まり; ) (Joined July 23, 2021 )

Trivia

 * They have a medicine concept