 If you liked
Okitegami Kyouko no Bibouroku
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 ...then you might like
Mystery to Iu nakare
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The first mystery in "Do Not Say Mystery" is similar to how the assistant in "The Memorandum of Kyoko Okitegami" is suspected whenever he is involved in a crime. "Do Not Say Mystery" is more grounded in reality but both manga require the usual suspension of disbelief complicated mysteries do.