Mika-chan possesses shoulder-length brown hair and matching brown eyes, dressed in a school uniform featuring a white blouse and dark blue tie. She temporarily resides with her cousin Sayoko, reconnecting with childhood friend Shin-chan during this period. Their bond strengthens through regular homework sessions until a shared viewing of an old VHS tape triggers a turning point. As adolescence begins, Mika-chan and Shin-chan gradually grow apart, their once-close relationship replaced by emotional distance throughout their developmental years.