A little sad
I recently replayed all the routes in Katawa Shoujo and found myself reflecting on a rather sad detail: had Hisao never gone to Yamaku—or had he failed to connect with one of the girls—most of them would have remained in a state of emotional stagnation or pursued self-destructive paths, just as the game's bad and neutral endings suggest. Hanako is likely the one who would have fared the worst. Without Hisao to provide the necessary confidence and draw her out of her isolation, Hanako would have continued hiding in the library, relying entirely on Lilly. This would have been particularly disastrous given that Lilly leaves for Scotland at one point in the story; without Hisao, Hanako would have been left completely alone, as she lacks the social initiative to make new friends on her own. Without Hisao to give her a gentle "nudge" to coax her out of her shell, she would most likely have retreated even further into the library or the confines of her own room. Then there is Emi, who avoids confronting the pain of having lost her father. Without Hisao to urge her to talk about her trauma, Emi would have continued pushing people away whenever they got too close emotionally, leading a life that was physically active but emotionally solitary. As for Rin, without Hisao attempting to understand her, she would likely have continued painting without ever finding a sense of purpose or a connection with others. Her neutral ending suggests that, even if she had managed to secure an art scholarship, she would have lived in a state of constant dissatisfaction, never evolving beyond her deep-seated need to be understood. Finally, I wanted to mention Lilly; unlike the other three, she is the most mature of the group. However, without Hisao, Lilly would likely have left for Scotland to rejoin her family, lacking a compelling reason to stay—or an emotional bond strong enough to make her prioritize her own desires over her family obligations. As for Shizune—to be honest—not much came to mind; I get the sense that, of the five, she is the one who would be least affected by Hisao's absence. The only thought that crossed my mind was that she might have become increasingly isolated and obsessed with order and Student Council affairs, thereby straining her relationship with Misha. The truth is, it is quite sad to realize that, for one of the girls to be happy, the others must face their problems alone.