Shizune is never an easy character to read into and is often a challenge for the majority to get through--which I believe is intended, as it is in-line with her in-verse character. Her disability is one aspect that contributes to her reasoning (she is in a sense, 'living in an entirely different world'.
Her route--intentionally or not--contains the most subtle feels that may feel alien to most who are unfamilliar with the customs and hints that were presented. Further, you really have to read what's happening in the background and around the character and Shizune herself to capture the most out of it--recently something tells me that Kenji's 'Shaman eyes' may hold more than just your comic relief scene.
He's telling something related to the story; question is, what is it?
anyway, her route--the ending in particular.
Remember how Shizune mentioned that she prefers 'action' rather than just words? Concerning Shizune, that statement of hers holds a much greater meaning than what it was because:
1. She can't speak or hear, thus in order to convey a message to her or from her, one has to use 'action'
2. That said, this makes 'words' to hold that of a greater weight as each one requires it to be fully thought-out
3. From the above, this made spoken words
to be that of a greater value; what you said, you meant it for sure.
Throughout the route, Shizune conveys her affection towards Hisao by action--either she planned a date, take him to meet her parents, make Hisao's lunch, etc. Never even once we hear from Shizune or any of the casts (until the end) them spouting 'I love you' vocally or by sign language--for Shizune, if she wants to say that she'd act on it
(i.e. giving herself).
'But what about the misplaced blurt hisao said at the end...'
Now, I'm not finished.
Like I said, words in Shizune's route holds a greater weight than contemporary as it needs to be fully thought out amd acted on. This made spoken words
to hold double than what it originally is
. You have to be 150% sure about what you're about to say and how serious it is, which in turn it gave a lot more perspective to Shizune's ending and possible hints on what will happen in their future:
1. Hisao starts her route by saying he has interest in her, albeit just a bit--in the end, he is fully committed to her.
2. Hisao will continue to 'chase' Shizune--what does this mean? This can be interpreted as him trying to reach her in a similar footing OR follow her on to the next chapter in their life which leads to...
3. Hisao and Shizune are going to attend the same university, together.
I may have read too deeply into this
But hey, it's a nice change if pace from the usual papers I have to work on