I enioyed the game a lot more compared to the manga but I read this ages ago before I played the game so I decided to re read it. Didn't realize Iori was in it too! Loved the games though.
The game is a lot more detailed and actually shows the character development although the manga didn't show it well, the time span between their love and when they started is actually probably around more than a month for sure, the manga wasn't great but the game is, so I recommend you all checking the game out. :))
Hanamachi Monogatari - Hatsuzakura Mau, Yoru No Shitone