The plot sort of standard, but from early-childhood Tomoki sees the same dream in which an unknown girl asking for help, saying that it "captured the sky." When he reached the pens, the guy with the grief turned to Eishiro Sugata - School expert on the paranormal.
He lucidly explained that Tomoki is associated with the heavenly world, the entrance into which opens tonight. The remaining answers are out there, here and found the main character under the age-old Sakura on night duty. When the sky opened up above him, and fell out with beautiful wings, the guy realized - life is lived not in vain.