Toki no Maigo wo Sagashite!

Orphaned at 16, when his parents died in an accident, Akito lives with Ko's family, his childhood friend. But, after an accident, Akito becomes an amnesiac, unable to recognize anybody, or remember any event from his past. Ko, who has been in love with his friend for a long time, takes care of Akito, trying to help him recover his memories. Could this amnesia be a new beginning for their relationship?