I really, really hope he will respect his own deadline and not just forget it about in the end.
There are already 320 days remaining, she won't make it at this rate.
The deadline itself is kind of vague. Here's hoping this story just gets more interesting as it goes along.
Also, his last words in this chapter gave me chills:
"Drown yourself in the sea of emotion and let it overflow out of you. To reach the filthy beauty known as blues. Welcome, Shiori. To this Hell called creation."