The elderly police officer finally found the sheet music left by Keiji Aso. After deciphering from it that he had another son named Narumi, Conan sensed that something was wrong.
Back at the community center, the test results for the knife found in the piano's hidden compartment came back. After learning that it was Nishimoto Ken, his thoughts became extremely confused. How could Kousuke's trickery be discovered so easily?
Conan felt something was amiss, so he went back to the various death scenes and found a small knife in the broadcasting room. Conan picked up the knife and was very puzzled because he hadn't found it during the day.
Conan still couldn't figure out the meaning of the coded message in the sheet music left by Keiji Aso.
Although Conan was very confused, the facts were undeniable, so he could only assume that he was mistaken.
Later, Conan gave the knife he found to Inspector Megure. After testing, it was found that the knife belonged to Ken Nishimoto. Everyone was puzzled as to why, but when Conan revealed the coded message in the sheet music left by Keiji Aso, everyone understood the truth.
The motives behind Ken Nishimoto's murders and suicides were understood to be excessive guilt leading to mental health issues and a desire to repay Keiji Aso. Once the motives were understood, the case was hastily closed with the conclusion that Ken Nishimoto killed two people and then committed suicide.
After Conan told Inspector Megure about Hirata Kazuaki's heroin dealings, Hirata Kazuaki was also taken away by the police for selling drugs.
Now that the case was closed, there was no reason for anyone to stay, so they prepared to take a boat home the next morning.
Late at night, Kōyū arrived at the beach and, as expected, saw Asai Narumi looking at the sky. Kōyū walked over and sat down next to her.
Asai Shigemi was taken aback when she saw the person beside her, then said, "Kouyu-kun, can't you sleep either? I..."
Before Asai Narumi could finish speaking, Kōsuke interrupted her: "You've finally avenged your father!"
Asai Narumi's pupils contracted slightly, but she didn't intend to keep it a secret any longer.
Having kept it a secret for so many years, she now needs someone to express her feelings: "Yes, I... I am actually Keiji Aso's daughter. When my family was locked in the house, my father told my mother and me the truth. At that time, I thought I was going to die. In despair, I looked through the flames inside the house at the four people coldly watching us from outside the window!"
"But luckily, the fire was too big. A corner of the house had collapsed due to years of disrepair, leaving a narrow passage that could fit one person. My parents got me out, but because the fire was so intense, a tree blocked the opening. My mother had only climbed halfway up when my parents told me to run quickly."
"I left that place with tears in my eyes. Later, I wanted to go find my brother, but he died because his condition worsened. My brother's last wish was to see my parents one last time, but... but..."
At this point, Makoto Asai's eyes reddened, but he continued fiercely, "Later, I used my brother Narumi's name and lived with a family in Tokyo. Then I returned to the island. Two years ago, after I told Village Chief Kameyama that I was Keiji Aso's daughter, Kameyama seemed to overreact, causing a heart attack, and he collapsed by the piano. So I played my father's favorite Moonlight Sonata as his funeral piece, and I suddenly had an idea to kill the remaining three people, but..."
"So you found them all dead before you even got a chance to do anything?" Guangyou waved his hand, smiled, and said, "It's not good for a cute girl like you to have blood on your hands, even though they deserved to die."
Asai Narumi was shocked to hear this, and her face showed that she seemed to understand something.
Just as she was about to speak, Kwangyu interrupted her: "Well~ it's good that you know, don't say it out loud."
Asai Makoto's expression returned to normal, but she was still somewhat incredulous, and she didn't ask.
As they quietly gazed at the starry night sky, both of them found peace in their hearts.
Seeing that it was almost time, Kwangyu stood up, waved his hand, and said, "Well~ Narumi unnie, that's all for now~ As a way of repaying you, you have to live well, maybe I'll need your help in the future~" After saying that, Kwangyu went back to his room to sleep.
Asai Makoto watched Kouyu's retreating figure, her eyes slightly red, but a smile appeared on her lips.
The next morning, the group returned to Tokyo by boat. Conan, sitting on his bed, was still scratching his head, thinking that something seemed off.
He racked his brains but still couldn't come up with a solution. His head was spinning. After thinking for a long time without any ideas, Conan lay back and gave up on thinking about it.
Guangyou looked at his hands, now stained with blood again, smiled, and looked up at the azure sky, revealing a meaningful smile.
...
Let me first explain that I changed my gender simply because I don't really like crossdressers, and it's not a harem and there isn't one.
It's just because I don't really like it. I don't discriminate against people, but I just don't like it.
That's why it was changed...
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