Summary
Gemini Izuru and Kokone possess a profound affection for their elder brother, although only Izuru has manifested her emotions thus far. Upon returning home from school, Izuru frequently approaches her brother and engages with him. Kokone, in contrast to her assertive sister, passively observes them while consumed by jealousy. Her only recourse is to derive gratification from the auditory stimulation of their lascivious activities.
One day, Kokone’s frustration escalates, prompting her to confront her sister and brother. Izuru assumes the responsibility of comforting Kokone, endeavoring to persuade her to express her emotions more candidly.