1 - Episode 1

Sachiko Tachibana interviews for a babysitting job at the home of famous pianist Rena Hanai, who is somewhat surprised by Sachiko's persistence.

2 - Episode 2

Sachiko decides to sneak into the room of Rena's father Minoru, a professor of criminal sociology, to search for evidence of Rena's crimes.

3 - Episode 3

Determined to make Rena suffer, Sachiko sets her sights on baby Kokoro. A covertly recorded conversation between Rena and her manager leaks online.

4 - Episode 4

After seeing how Rena truly feels about Kokoro, Sachiko rethinks her tactics and soon realises that the key to revenge may lie in Makoto instead.

5 - Episode 5

Under the pretense of preparing for Rena's surprise party, Sachiko arranges to go shopping with Makoto. However, Rena soon grows suspicious.

6 - Episode 6

Sachiko learns from Minoru that Makoto's mother was murdered. Later, Makoto feels something familiar when he hears Sachiko playing the piano.

7 - Episode 7

Rena has a realization as she watched her home surveillance feed. Sachiko begins to feel conflicted after Makoto makes a stunning confession.

8 - Episode 8

Rena loses her temper and comes at Sachiko with the scissors - but she is interrupted when Makoto returns home and makes a surprising announcement.

9 - Episode 9

With both Rena and the evidence missing, Minoru tells Makoto they should go to the police. Meanwhile, Sachiko receives a phone call from Rena.

10 - Episode 10

Having told Sachiko the truth about his mother's death, Makoto goes to the park where he and Rena had their first fateful encounter as children.

11 - Episode 11