Фуджіномія Неко

While claiming that she just needs Masamune to pretend that their first encounter were real, Neko is actually genuinely in love with Masamune when he's still chubby, although it is never revealed how. After Masamune rejected her, Neko's condition got worse and she underwent a surgery abroad, and then came back with better health and thus continue to support Masamune.