Both are GL series based on GL novels, Call me is from Japan, ClaireBell is from Thailand. Both series have a very artistic visual style, they both deal with serious themes and are darker than most GL series.
Both are Thai GL. One of the authors that wrote the Petrichor novels also wrote ClaireBell. Both have darker subject matter than usual GL series. They both deal with criminals.
Both are unconventional Thai GL series. They both take place in an environment where there are only females (All-Girls School and women's prison), many of the characters are flawed, have committed some type of crime or possibly dangerous.
Both are Thai GL. Both are darker then the usual GL. Both have a romance that starts with the protagonist not knowing whether she can trust the love interest. Both have crime in them.
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