Keep the Secret!

[Cells at Work! BLACK]
"That diary could have provided him with any evidence, if only he had the courage to take a look at it.
Instinctively, his hand slowly reached for that precious book... only to pull back quickly afterwards."
On a peaceful day like any other, the constant temptation to read a certain diary in its entirety has unexpected consequences.
[Set after Chapter 10 of the manga | Episode 13 of the anime] [Missing moment]
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Italian version here: https://www.wattpad.com/story/179715073-keep-the-secret