Kanetsugu Gasou

As the 17th head of the Gasou household, she carried the dual burden of reviving her family's fallen name and covering her younger sister's medical expenses. Exploiting a childhood resemblance in build to the male lead and a phonetic similarity in their names, she disguised herself as a male to impersonate the 'Masamune' living in Aki's memories. Once her scheme was exposed and her true gender revealed, she let go of her obsession and returned to an ordinary life, working part-time alongside her sister — a testament to her deep family bonds and resilient spirit.