"It was hard to accept him."
"He seems to have disappeared, but I don't know where he went."
"He shouldn't have been there, but I saw him again. I had a headache and took sleeping pills."
"Do you know how scared I am? I don't trust myself anymore."
The diary in Shirasaki's hand fell to the ground.
This diary actually contains the second person... Was it written for others to read?
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Three uninvited guests knocked on Shirosaki's door on a gloomy afternoon.
The ensuing bloodshed, the hidden information in the diary, and all the clues eventually point to a long-dead man.
Everyone has secrets that they would rather tear out their hearts than tell them. Those secrets do not exist in your heart, but in the depths of your brain.
PS: The plot is tricky, so if there are any loopholes, remember to tell Hui Zi! It's rare to write a reasoning, I even cried because of my stupidity QAQ