Sakaguchi plays the lead character Saegusa Kento, a police officer who manages to connect to another police officer living in the past through a disposed walkie talkie and the two of them work together to crack unresolved cases. Saegusa works at Josai Police Station and learnt criminal profiling on his own. When he was a child, there was a kidnap-cum-murder case involving his classmate and his elder brother committed suicide due to a past case. This led Saegusa to be scarred emotionally and he has a deep distrust for the police even though he became a police officer to find the truth behind his brother's death.
Sakaguchi commented that he was really happy to be offered his first leading role and is raring to go and give it his best shot. He revealed that when he first heard of the storyline, he was very interested in it and described his character as one who is tormented mentally by his dark past. As such, he wanted to take on such a challenging role.
Sources: Sanspo / Sponichi / Oricon