Shinichiro Hanasaki is a former detective with the police department, which is currently engaged in the nursery "Smiling Garden". Wishing to help poorer families and single parents are very low fees for childcare, but this means that it is still far broke. To replenish the budget decides that during the night will have a private detective agency. ~~ Adapted from the novel series "Hanasaki Shinichiro" by Shibata Yoshiki.