I really love the art style, Marika hair especially, also love when a character has sex or sexual intimacy as a form of selfharm. But the story is quite weak? Edgy is not the word, Marika dialogues feel pretentious or cliche Idk how to say it
I don't think the story is weak, more just simple/straightforward. Marika being a teenage edgelord is I think deliberate; not only does it fit with what she ends up doing, but it's also precisely what draws Yuina to her. Yuina's experiences have taught her that the world is an empty, meaningless place, and so Marika's ultra-cynicism reads to her as honesty.
While I agree the art is the main draw to this oneshot, not just the quality itself but also the paneling, pacing, and overall usage of the art to tell the story and convey emotion, I think the characters are pretty interesting too. Definitely one of the better oneshots I've seen in a while.