I miss nana and kaoru, but i think this is still a nice change of pace, last arc had a different vibe to it, this is back to chapter 1 almost. It's good
Tachi exists to counterpoint the tension and unspeakability between nana and kaoru, she is blunt and honest in what she wants and that helps the writer speed up the pacing in a way that wouldn't make sense if it was just nana and kaoru