From the film「A Story Sewn and Bound with a Red Thread」

The music “Hide and Seek” was composed by Magdalena Zuk 
who was inspired by the poem “Shojo-shishu” (Girls’ Poem) 
which was written by Shuji Terayama. 

It speaks to the loneliness and sadness 
everyone to some degree has in their heart, 
something important that you cannot have back, 
no matter how hard you chase it you have lost it, 
perhaps in a back street; 
we should know it well; 
we may find another me in myself.