Toki no Maigo o Sagashite!
Complete | minaduki yuu | 2000 released
1. Kid loses his memories. Best friend, whose family he lives with, tries his best to help him get the memories back, while trying to hide his love. 2. When a coworker shows up with his sister's baby and asks for help taking care of the child for two weeks, man is thrilled to have his crush living in the same apartment.
Koujitsuei no Tobira