Suimasen Scans
joined Feb 8, 2024
The story is sort of exploring the theme of how hierarchies reproduce themselves through abuse, coercion, and violence. Tsukasa isn't out killing monsters as part of some master plan—he's doing it in spite of one, because his grandfather threatened to kill Aju if he didn't. She's likely aware of that, and I don't think she's so altruistic as to submit to a death that is almost certainly guaranteed to traumatize Tsukasa into compliance. They accept this is how things just are, and hope to change it in the future.
However, Tsukasa being the designated monster slayer is essentially a hazing ritual to make him complicit in upholding the existing power structure. A person who commits atrocities will almost certainly never be able to regain the trust needed to negotiate a lasting peace, and so the family's position at the top of the hierarchy, not to mention their extremist position towards monsters, will be maintained for another generation.
You also catch bits and pieces of how those dynamics perpetuate the power structure, whether it's Urabe losing a loved one to violence (presumably by an ogre's hands) and the Watanabe group playing on her insecurities as a woman in a leadership position, to Hinata being coerced into her role as the next Shuten-doji despite her desire to escape that role.
That's what Naori and Hinata have to wrestle with if they want to be together. They are a same-sex, interracial couple in a violently conservative society, and their relationship carries a freightload of historical baggage that they have to deal with in some way or another. They can either confront the system or run away from it, but either choice carries its own set of problems.