Oh, Kurumi actually wasn't joking when she said she's repaying this huge favor. (Mainly the favor of saving her life, because she was only able to survive Origin with Shido's warning.) I would say what she's going to do next is totally unexpected, and what she did actually made a difference in fighting both DEM and Origin. Look forward to next week then.
"When's the last time she rested?" Welp, in the very first LN volume (not sure if this was adapted into the anime) she dropped a line saying "I haven't been able to fall asleep since 30 years ago" to explain her heavy bags under her eyes. This marked my first suspicion on her being related to Origin, as we were told in the very beginning that the first spacequake happened 30 years ago. We know that can't just be a coincidence as an anime audience. Back to Season5, in the LN they gave us a brief moment of Reine POV, explaining how odd she thinks Shido was acting and what's her speculation on what he's cooking, also mentioning that she only does stuff like showering and going to bed due to "That's what a normal 20 to 30-ish year old woman will do" as she can self clean herself with spirit power and she can totally function normally with no sleep at all. It was also mentioned here that she was never able to fall asleep after Shinji has died, causing her heavy bags. The reason she laughed is because she noticed that the reason she fell asleep is because for that small brief moment, she actually acted as if Shido were actually Shinji, and they were on the date on their favorite beach, allowing her to actually able to fall asleep for once.
