1. Episode 1

Ken investigates a 15-year-old murder. Using an old radio, he communicates with a deceased detective, uncovering the truth and a manipulative killer.

2. Episode 2

With 20 minutes left on Ayaka Tadai’s case, Keiko stays silent. Years later, Ken helps Oyama save a woman, updating the case to "attempted murder."

3. Episode 3

Oyama prevents an attempted murder. Ken finds Eiko Yashiro's body and learns Midori Kitano is the next target. Oyama searches for her.

4. Episode 4

The next victim, Midori Kitano, is known to Oyama. Ken finds that Hitoshi Tanaka is the killer. Evidence and Tanaka’s confession uncover the truth.

5. Episode 5

In 1998, Ken’s advice leads to Kudo’s arrest. Kudo kidnaps later, and Ken feels guilty. Oyama, in tears, blames himself when the radio connects.

6. Episode 6

Profiler Ken Saegusa connects with 1998 detective Oyama. After Kudo’s arrest ends in tragedy, they suspect Tomohiro Shiraishi as the true culprit.

7. Episode 7

In 2018, Ken and Oyama arrest Shiraishi, but charges are dropped. Kudo kills Yabe, and Iwata warns Ken before being found wounded.

8. Episode 8

Profiler Ken Saegusa connects with past detective Oyama through a radio. In 2018, he finds Oyama's body buried while investigating a 1999 assault.

9. Episode 9

In 2018, Ken and Misaki find Oyama’s body. Ken, remembering Oyama’s kindness, pleads for help to prevent his brother’s death in 2000.

10. Episode 10

In 2000, Oyama can't save Ryota from Nakamoto. In 2018, Ken and Misaki, remembering the old reality, search for the missing Oyama.