Tantei no Tantei (2015) – Dramacool

A suspenseful, action-packed, fast paced, intelligent detective thriller.
The cool, beautiful Sasaki Rena is the lone investigator who works for for a medium-sized research agency called Suma Research Agency. Because of her past related to her sister’s death, she became a detective that investigates and pursues unscrupulous detectives. Her beloved younger sister was murdered by a stalker and she has been searching for the investigator who caused her sister’s death in order to take revenge.

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