But that isn't right about Shiki Tohno and Shiki Ryougi. At least earlier on in the story it was mentioned that Shiki Tohno's eyes caused a burden on his brain because his brains weren't able to comprehend death while Shiki Ryougi didn't have this problem as she was able to study death through her connection with root allowing her to understand death so no burden. Mc can understand death because of his soul so it should not cause a burden on his brain but only on his soul as it is too frail to contain a lot of death. So I'm wondering what that limit is all about as he didn't have to limit the use of his eyes because he didn't have a burden. Soo Jeanne's situation kind of weird yeah. But does that mean she's a harem member? Does she like him? Technically you could state she slept with him while at the same time she didn't.