Natsuzora ni, Kimi to Mita Yume

Yuuri's a pretty high school girl.
One day, a stranger asks her to attend the funeral of Hirose Takaya.
"He really liked you." that's what he says. But… who is this Hirose Takaya?!
She reluctantly attends the funeral. After that weird stuff starts happening.
A heartbreaking, pure love story.