Shoujoeye

They were the famous high school detectives; their mother is currently the police chief at the 7th division office. They were known for letting case perfectly closed and apprehended most of the criminals within the vicinity. 
But one day, their mother died and left a hint to lead them where to investigate and solve the case. They don't know about their parents' past until they start investigating and found the half piece of the answer. 
As they try to solve their mother's death, they experienced multiple crimes that hinder them to find the answer immediately. 
Until one day, they encounter the most dangerous crime... they fell in love.
Watch them as they go through these crimes and found out their true stories behind it.

End of my breath