I think you're being too hard on yourself about your activity. Yes, you've slowed down a bit from your usual levels, but so has everyone. The game's been quiet and I feel like you've been around really consistently. So that's always great to see, because you're so good with backtagging anyway, and you consistently tag back, etc etc.
I looooved Koryuu's latest silliness. His entry and his log with the pranks were so much fun. I love seeing more of his mischievous side now that we have a Kohaku. And I love seeing his interactions with everyone. He's always so much fun and so unpredictable. I think you do a great job with him.
I honestly don't have any characterization crit to point out. Your characters are as much fun as always. One thing I will say, though, and this could very well be because of relative game quietness or not, but I'd love to see Miyuki getting into more interesting situations. I love seeing her scandalized or shocked or all flustered. Not to say she isn't already, but I'd like to see more of it, too, just because it's fun and provides a different way to interact with her.
Overall, great job, as always. I'm loving stalking your characters.