The author really sells the feelings of anxiety and uncertainty in their expression work for each character, and then immediately cuts through that sense of discomfort with reassurances that everything will be okay.
And that really pays off with this chapter - taking the solitude of nighttime, with the act of facing the light of dawn through the window of your bedroom and making it a happy memory, is that sense of "easing the anxiety" made manifest.
Rather than the loneliness of spending an entire night by yourself just to watch the Sun come up, it's reframed as a period of expressive creativity, culminating in greeting the dawn as a special guest the share the moment and afterglow.
And that's what they're all experiencing in this group, I think, in one way or another. It might seem like they're lonely, that they're anxious and unsure, but then they come together, speak their minds, and everything works out and sees them grow closer and stronger. Like the Sunlight pouring through the window, it's a reassurance, and a re-energizing to meet the day and do your best.
"Sorashimaru" is an awesome name and a perfect fit for their group, and for the vibe of this series, I think.
Thanks for your continued work and care with this title.