ALIASES 725-senpai
(by 036)
 STATUS Active
 GENDER Female
 SPECIES Red Blood Cell
 MANGA DEBUT Chapter 17

BK7253 is a character in Cells that Don't Work. She is a close friend of 036.


She is an impish erythroblast codenamed 725. She met 036 while studying in a library when she is studying for the final exam. 036 keep studying together with BK7253 until she graduates. After a long time, they finally meet together. BK7253 tries to persuade 036 so he could graduate and regulate the body together. 036 persistent to refuses, so she left him for good.


As a red blood cell, she is a worker that is unable to protect herself. Therefore her job is to only transport goods.

  • Overall Abilities: Despite having no abilities to defend herself, she is capable of transporting goods into all corners of the body with high acceleration. She's even adept at getting through incredibly tight spaces, albeit with considerable difficulty.
  • Reversible Jacket: All red blood cells wear a reversible jacket that helps them indicate their speed when moving around in either veins or arteries. The jacket has extendable sleeves and zips up for colder weather.
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