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Both Boku no Hatsukoi wo Kimi ni Sasagu and Koizora are extremely intense love stories. Both will almost certainly bring you to tears. If you like one i most definitely recommend you read the other.
Both manga are beautiful intense love stories that follow the main couple through original meeting, falling in love, and all that entails for many years...
The main heroines in both stories really show growing strength of character over time, and you will cry as you follow their journey. Koizora is perhaps more focused on the heroine, whereas as Boku No Hatsukoi is more evenly balanced in POV between both the male and female half of the couple.
Both of them amongst my favorite mangas!
Both stories are about a couple who from childhood have a deep love for each other, and how through hilarious and sometimes very irritating circumstances have trouble forming a solid relationship with one another. Kimi no Iru Machi is slower passed then Boku No Hatsukoi Wo Kimi Ni Sasagu, but it has far more twists and turns. Both are exceptional manga's that will have you reading for hours on end, to find out whats next...