Soo think this anime is old and I've watch it a long long time ago and I want to watch it again but I can't remember the title..

All I know is that this anime's main genre is mystery the female lead is pink-haired and in highschool ?? Then the male lead is a boy that lives in a mansion ?? He is also wearing a big white ribbon on his neck along his black coat and shorts. So they solve mysteries revolving around them and the girl's school. But there's an episode where it is revealed that the male lead is actually a grown man that lost his memories??(I'm not sure) and turned into a child. If I'm not mistaken in the first episode there was a moving armor in the girl's school....that's all I can remember
Thanks~

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"Bravery we all have it"

I've found the anime !! The title is Matantei Loki Ragnarok

________________
"Bravery we all have it"