This is going to be awesome for sure.
8th grade syndrome old(?)man who likes 'em HARD BOILED now has to go to kindergarten,get an education,suffer through it all,and eventually heal the real lil' girly so they can switch back.
Would be a nice surprise,though,if she ends up geing his partner in crime,they take out all the baddies,and then live a peaceful life like father n' daughter.
Hell,she might even grow up and marry the geezer,which would very much crack his hard boiled-ness for sure.