夏に、ゆきが降るように。 : In other words that means I love you
なつ に ゆき が ふる ように : いん あざー わーず ざっと みーんず あい らゔ ゆー
est. Rough estimate based on volume count, reprints and magazine — not an official figure
External databases: MADB
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections