Which Anime Uses Heartbeat As A Plot Device?

My heartbeat is so steady that sometimes, I don't resemble a human being at all. The fluctuations in my heart rate are very small even though I might be sleeping, suffering from a fever, or losing too much blood. When I'm 18 years old, the Ziegler family admits me into a rehabilitation center. My new home is now a temperature-controlled intensive unit located on the top floor. Oh, Aiden Ziegler doesn't love me at all. It's merely because the one and only artificial heart present in this world—and also in his chest—needs to be fine-tuned with my own heartbeat as its primary frequency. If my heartbeat is steady, he gets to live. If not, he dies. Three months ago, a nurse accidentally took off one of the monitoring pads on my chest. Five minutes later, Aiden, who was ten thousand miles away, went through a temporary crash where his heart stopped. The next day, the third-party medical company filed for bankruptcy. Everyone who was involved in this incident got banned by the medical world. Because of that incident, all of the sounds get eradicated from the top floor. Even the elevator's chimes get muted when it reaches the top floor of the rehab center. Everything changes when Aiden flies to Iropa. That's when his fiancee, Mandy Sutherland, takes over the rehab center. As she flips through my medical bill of nine figures, she sneers at me. "So, the Zieglers are basically sustaining a loser who does nothing but gasps for breath while lying in bed, huh?" After that, Mandy tears off the monitoring pads and unplugs the sync line. Then, she forces me to get on a treadmill. "That'll be a six-mile run for you. You can forget about returning to the top floor if you can't finish the run." As I grip the handrails tightly, I can feel my heart rate turning erratic for the first time ever. It feels as though my heart is about to burst out of my chest. As soon as the alarm goes off, Mandy turns it off immediately. What she doesn't know is that Aiden's artificial heart has already gone crazy, just like mine, while he's stuck in a place that's 12 time zones away.

When Aiden Gomez, the heir of Gomez Robotics Company, is shoot to death by their family's mysterious traitor and falls into a coma, his scientist grandfather creates an artificial intelligence humanoid robot to take his place. His name is Aiden 2.3 who looks exactly like the human Aiden. In the middle of their mission, Enzo Romeo, a good-humored programmer, find himself falling in love with Aiden 2.3 whose robotic and programmed heart starts to beat like a real human. "What kills people are their personal ambitions."

After my rebirth, the very first thing I did was ride from one blood donation van to another, giving blood until I nearly collapsed. Why? Because in my previous life, my fiancé's newly hired intern, Shirley Lynch, had bound herself to a blood-exchange system. Every milliliter she donated was siphoned directly from my own veins. In just a month, she transformed from an ordinary college girl into the nation's beloved Blood Angel, showered with fame and fortune, while I, suffering from severe anemia, was fired from the hospital for being unable to work. When I exposed her scheme to my fiancé, he looked at me with disgust and broke off our engagement. "You're selfish and cowardly," he sneered. "You refuse to donate your rare blood type, and now you slander Shirley? You call yourself a doctor, yet you believe in such ridiculous nonsense!" From then on, every time Shirley donated blood, I would suffer heart palpitations, dizziness, and sometimes collapse outright. I begged the doctors in my department for help, but my fiancé blocked every attempt, accusing me of jealousy and wasting medical resources. In the end, to steal my promotion ahead of schedule, Shirley donated a full 1000 milliliters of blood live on television. As her blood drained, so did mine. I went into shock and died. When I opened my eyes again, I was back on the very day Shirley first claimed she carried my rare blood type.

When the nurse pulled the IV needle out of the back of my hand, her gaze was filled with pity. “Mr. Young, the heart meant for your transplant was transferred at the last minute. It was sent to the VIP ward on the seventh floor. It’s a shame, but all your pre-operation prep has gone to waste.” Marcus Stewart was warded on the seventh floor. He was the frail young man my sister brought home. Ten minutes ago, Marcus suddenly had terrible chest pain. My usually strong mother burst into tears. My stoic father slammed the table in front of every expert in the hospital, then decided to give Marcus the heart I had been waiting three years for. It was supposed to save my life. I hurried to the end of the corridor, but the green operating light had already come on. Clutching the twisting pain in my chest, I leaned against the ice-cold wall and slid to the floor. There was no need to wait anymore. My heart failure was terminal. The doctor said I would not last the next few days. The mechanical voice sounded in my head. [Master, your vital signs are rapidly deteriorating. If you terminate this body and leave this world now, you still have a chance at a new life. Would you like to proceed?] I looked at the faint grey hue of death tinging my fingertips. “...Yes.”

Just because I ate one chicken leg more than my brother, my father kicked me out of the house in the middle of a snowstorm. Later on, my father of an archeologist dug up my body. Due to my missing head, he did not recognize me. Even when he saw that the body had the same scars as I did, he did not care. Later on, my mother dug out my heart and showed it to her students. "Today, we will study the heart of someone with congenital heart disease." She once said she would recognize me no matter what I looked like. Mom, now that the only thing left of me is my heart, do you still recognize me?

The moisture condensed from the atmosphere that falls visibly in separate drops came unexpectedly. People had no idea that raindrops carry an infected agent, which consists of a nucleic acid molecule in a protein coat and multiplies only within the living of a host. It's like a piece of code that can copy itself and has a negative effect, such as corrupting the system and destroying the mind's rational data. A virus that was so small and infectious that once infected, a person's body became a reservoir of virus particles, causing the infected person to become carnivorous. Every second is crucial. Who will save humanity from the undead army? Will you save the world even if around you is on the verge of death?