Boku ga Imouto wo Korosu made

Mikoto is a charming girl who easily captures the attention of those around her. After losing his parents, Masahide regards his younger sister as his only remaining family. One evening, Mikoto commits a violent act in front of him, causing a shift in their relationship. What initially started as a bond of care gradually transforms into something more sinister, pulling the two into a tense and uneasy situation.