Monaca is the half sister of Haiji Towa, Revealed in chapter 5. Monaca was a unwanted child, being abandoned by her mother shortly after birth. Her father took her to his side of his family shortly after. Haiji always hated her, seeing her as a 'Alien'. It was also implied Haiji may have abused her at one point.
Even though Monaca was widely hated in the family, she became the chef executive of the Towa Group robotics branch, even being able to surpass Haiji Towa, which did not help there relationship.
Near the end of Chapter 5 in Ultra Despair Girls, after the fight with Monaca. Haiji was able to get inside Towa Hills top floor, after Monaca spots him, she cry's for help. Haiji laughs, telling her to never call him her brother. Saying she was a mistake made by her father. As the chapter moves on, Haiji often grabs Monaca's hair, forcing her to confess her actions to Toko and Komaru.
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The familyship sailed as a result of the reveal that Monaca's related to Haiji, being his half-sister. Due to Haiji's controversial status in the community, fanart of the two are rarely drawn. If they are, it often depicts Monaca getting revenge in some way.
- Haiji's relationship with Monaca on Danganronpa Wiki
- Monaca's relationship with Haiji on Danganronpa Wiki