Also I enjoy a love story. I sniffled. Young couple are so pure and single-minded.
The song in ending is ひこうき雲 (hikoukigumo) "contrail" The singer is 松任谷由実 Yumi Matsutoya. and superstar in J-pop for a long time. We call her Yuming ユーミン She makes a lot of albums and hit songs in Japan. She sings in Stagio Ghibli's film, 魔女の宅急便 "やさしさに包まれたなら" Yasashisani Tsutsumaretanara Her lyric is especially great and emotional. I love a lot of her songs. If you learn Japanese, her lyrics is so beautiful and might be useful for learning Japanese.
I hope you can see this film in your country near future in the theater.