Sinful Sacrifice Gaiden: Brother’s Obsession Turns to Tentacles

Synopsis

■Story―To love every part of my sister, no matter what form it takes!―

The protagonist lives alone with his sister Kaede due to his parents’ circumstances. At school, he maintains a reputation as an excellent honor student. However, he harbors a severe sister complex and loves Kaede from the depths of his heart. Though he recognizes his desire is impossible, he secretly wishes to one day make Kaede his and love everything about her.

One day, while retrieving his phone from some bushes on the way to school, he sustains a small wound—possibly from an insect bite. The wound quickly disappears as if nothing happened. But afterward, strange changes begin to manifest in the protagonist’s body…