Toni Collins, resident of Ramenji, next-door neighbor to the Ishikari Ironworks and childcare extraordinaire. She and Sammy have a (strictly platonic) relationship where she pretends to be his ex-girlfriend (one of many) and passes off his three kids as unrelated kids she's tutoring, in the times where they're in town to visit their dad.

She gets a percentage of his income (both his allowance as an ironworker and his Teambase salary), and he has a very accessible way of seeing and taking care of his kids while keeping his "secret" from Kai and his siblings. It's needlessly complicated.