Yurika's mother is practically non-existent in the manga and why she never appears or is mentioned by her own husband and daughter is a mystery. However, if you take Yurika's problems, womanizing behavior and her relationship with Saori into account, it is very likely Yurika's dad underwent the same situation with her mom. Except that her parents got married but overtime her mother couldn't stand her husband's antics anymore and walked out on him at some point after giving birth to Yurika.
