So this is only 3 volume, and based from volume 3 cover, I think this is happy end(?)
Someone... will someone make the spoiler, or pick this up again(?)
long story short:In the end, Kiichi accidentally revealed his feeling to Hana. While at first shocked at this, Hana eventually returns his feelings. In the epilogue, they are married.
Honestly I'm glad I bought the tankobons. This series is just amazing