Well, other routes also have unique moments so I wouldn't cross out other girls. One of the key features of this game is that each route has a very different tone and are not the same experience. That's something we are really proud of as each route can offer players plenty of memorable moments you wouldn't expect and cast of characters that are much deeper and have more layers than it looks on a first glance
As for completion sake, Shiori's route is also completed and has over 100 scenes. Her writer also plans to extend it by optional scenes, but critical path is already fully playable, including multiple endings. Akira's route is also close to the end. Naomi, Honoka and Aida are over halfway long of their planned storylines