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.

Current Members

 * Usami Miu (うさみみぅ; ) (Joined March 5, 2023)
 * Kanzaki Ayame (寒咲あやめ; ) (Joined March 5, 2023)
 * Kouzuki Namu (神月なむ; ) (Joined March 5, 2023)
 * Murai Nazuna (村井なづな; ) (Joined March 5, 2023)
 * Suya Nenne (栖夜ねんね; ) (Joined April 16, 2023)

Former Members

 * Egami Nana (廻神なな; ) (Original Member, Fired November 28, 2021)
 * Hoshi Tsubaki (星つばき; ) (Original Member, Withdrew August 2022)
 * Nemuri Nen (眠裏ねん; ) (Original Member, Withdrew September 2022)
 * Minase Eri (南瀬絵梨; ) (Original Member, Withdrew September 2022)
 * Momose Mari (桃瀬まり; ) (Joined July 23, 2021, Graduated September 2022)
 * Saki Fumika (佐木ふみか; ) (Joined March 31, 2022 ; Left ?)
 * Yuikawa Yua (結川ゆあ; ) (Joined March 5, 2023, Left June 9, 2023)

Trivia

 * They have a medicine concept.