Honda debuted on the ISU Junior Grand Prix (JGP) circuit in the 2015–16 season. Ranked first in the short program and fourth in the free skate, she came away with the silver medal at the JGP in Colorado Springs, Colorado, having finished behind Yuna Shiraiwa by a margin of 8.06 points. She won gold at her second JGP event, in Zagreb, Croatia, after placing third in the short and first in the free — outscoring Wakaba Higuchi by 6.16 points. These results qualified her for the 2015–16 JGP Final in Barcelona. In November, Honda placed sixth at the 2015-16 Japanese Junior Championships.