Hummingbird Effect

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Briefly about Hummingbird Effect manga: Several generations ago, a mysterious phenomenon occurred. People were dying after 1.5 billion heartbeats; half their heart rate was originally. Schools began to teach students to control their emotions and to conduct regular heart rhythm tests. No one can use more than the amount assigned per week.This is the story of 2 girls who chose love in this world regardless of their heartbeat.