What the heck child exploitation for cheap labor no can do but literal free labor yes what the heck this author smoking some crak kokaine child labor was used greatly in the 19th century-20th century to mine a bunch pf resourses like coal, iron and other minerals mostly because of their litle child hands.this is what happens when an entire nation forgets its own history from the 19th century to early 20th century.
Sure, expose your Multiplication ability.
Now, the God of Currency allows the next generation regardless of age to inherit their parents' debts, so we can introduce one of Japan's favorite Isekai tropes kinks: Slavery.