My Detective Geek (ShinRan - DC)

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Ran Mouri is a simple girl living with her father, who loves karate and secretly in love with her childhood friend Shinichi.
Shinichi Kudo is a popular highschool detective living alone, who loves to sneak in every crimes and do his master deducing abilities and secretly in love with his childhood friend Ran.
Before their love can bloom into something beautiful Shinichi come across the dealings of a dangerous Black Organization and vanished like a thin smoke. No one knows where he is even his best friend Ran. On the other hand, Ran is worried but patiently waiting, putting all her trust and heart that Shinichi will never abandoned her.