This show is loosely based on Hana Yori Dango and in that show Tsukasa does have a memory loss and that track though painful was really a touching track. I remember the one line from that track which his friends mention and it was so poignant. They say even thought his mind has forgotten her, his heart didn't and that the reason he is drawn to her despite not knowing her.
It also has funny moments where she tries to get him to remember her and one time she punches him like she did before.
So even if there is a memory loss track if they do it tastefully I think it would be great!!!!!