Moved By Affection -The Incident of Chizuru, Karate Musume-

Chizuru Kamiya has spent her whole life at her father's dojo, chasing the strength to inherit it one day. Tomoki Okuta has spent ten years training beside her, ever since she pulled him away from a group of bullies as a kid, and somewhere along the way training stopped being the point.

The story turns on the day their unchanging routine breaks. Someone else enters Chizuru's orbit, and what follows plays out through cheating, coercion, and a slow erosion of the life Tomoki thought was settled, with multiple endings depending on how far things go and who ends up in control.

You read through Tomoki's side of it as a visual novel, watching the dojo's daily grind curdle scene by scene rather than steering fights or stats. The Japanese voice work carries the tension in the quieter moments, and the artwork stays 2D and censored throughout, so don't expect it to spell out anything the writing hasn't already made clear.