In this song, (which belongs in a series as well with 'The Riddle who won't solve riddles' which is sung by Rin)Len, the detective, is singing to Rin who is a witness in a murder case. Len repeatedly asks Rin "So, who is…
Saa hannin wa daare?
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If you listen to the sequel, The Riddler Who Won't Solve Rid…
It's scary!