This is a letter by The Nakano siblings father before his death
Dear Kids,
I'm sorry I couldn't save you; I knew I couldn't help Miku fight her depression; when I found out you were all dead, I was in pain and in the hospital, suffering from a heart attack.
I can still feel your trusting body on my shoulder when you were all kids. You'll fall asleep peacefully in my arms. Your little hands are still tightly gripping my pinkies as we went for a walk.
I'm sorry I was away when you were all alone without a mother, I'm sorry I wasn't there to guide you all through your studies, and I'm sorry I couldn't hear your thoughts.
Please forgive this egotistical and cruel father.
As I saw you dead, I saw Ichika and Itsuki alive; I didn't tell Itsuki that Ichika was alive, and I took Ichika to another place outside of Japan to raise her; she was handicapped and in vain, so I did what I needed to do and did something no one has ever done.
I brought her up and brainwashed her into forgetting Uesugi, but she eventually came to her senses and vanished.
It's all my fault, and I'm not sure what to do next, Itsuki. If you're reading this, it means I'm no longer alive.
Please look after yourself and protect Fuutarou; I know he's a good man, and I wish you both the best. I hope you don't harbor resentment, but your father wants you to be happy.
I adore you all; you are my treasures.
Thank you for the memories
love you always
Your father
....
2 Hours back
(Itsuki's View)
" No way, father how could you do this" I cried in the corner
I suddenly stood up , " Fuutarou doesn't know this I need to go help him"
I soon went to the police quarters and informed them
" Are you sure it's your elder sister Ichika" the detective inquired
" I'm not sure, as said by my father, that's definitely Ichika" I said
" fine, but do you you where where they went ?" he asked
" I'm not sure" I started thinking, suddenly...
" there's one place"
"where ?" he questioned
" the one place, didn't dare to enter again, our old apartment"