This starts less messy than Kitanai Kimi ga Ichiban Kawaii, but still I can see the potential. Waiting in anticipation for it to get messier to the point it's irreparable.
Just a thought, but Tsukasa's friend didn't seem to know she had a girlfriend. She introduced her as kind of a loner, but Tsukasa's clearly used to doing this. Her girlfriend also believed that she just overslept. Maybe being a shut-in is kind of her cover story.