Mahou Shoujo Madoka★Magica - Mubou Shoujo Sayaka Sowaka (Doujinshi) - Vol. 1 Ch. 5 - Reckless Detective Sayaka - The Murder at Tomoe Residence

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"It's starting! Sleeping Sayaka's reckless reasoning...!" (Page 2)

Reference to Sleeping Kogoro from Detective Conan.