Haru does love Legosi in the manga. It's evident in the way she cares for him, shows concern, and their shared experiences strengthen their bond, making it clear that her emotions towards him are those of love.
Sure, Legosi and Haru do get together in the manga. Their relationship develops over time, facing various challenges but ultimately finding their way to each other.
Well, Ao Haru Ride has made considerable progress in the manga. There are new challenges and twists for the characters. However, it's hard to give an exact measure without knowing your specific benchmark.
I'm not sure specifically as I haven't played it. But generally, a visual novel often has a story with characters, and it might involve different themes like friendship, adventure, or mystery. 'hatsu inu' might be the name related to the story's setting, characters or some unique concept within this visual novel.