The Detective Is Already Dead, Vol. 3 (manga)
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Due to my penchant for getting dragged into things, I, Kimihiko Kimizuka, an ordinary high-school student, suddenly was asked to protect national idol Yui Saikawa's Three-billion-yen sapphire!? When there's a detective, there's always a case, and so, another case begins for me and Siesta’s heart’s recipient, Nagisa Natsunagi!