Board Thread:Questions and Answers/@comment-38844844-20190610130920/@comment-36009152-20190611092135

LauraTepes wrote: Some people have a theory that Mika and Krul are brother and sister because Krul could also have Yū ' s blood and her having the Michaela trait (Mika is one of the nominated for having the Michaela trait) As AquilaeAltair explained Mika and Yu are not biologically related ('brothers' as in orphanage brothers) so Krul shares nothing with Yu blood wise.

The key point is people can be at ease that anything they would like between Mika and Krul is not over, simply because the author would not sink the ships themselves!