Kingdom of Light's Sword Fighter: If You Are a Brother, Give Me a Knife

After traveling through time and becoming a dying Ultraman, he was rescued by Hikari and brought back to the Kingdom of Light, where he became his younger brother. Kira awakened the knife-fighting system, and began to jump repeatedly on the edge of death every day. Fortunately, Taro, a grudge, helped him block the knife! In the early stage, it will be roughly the daily routine of the Kingdom of Light. The main plot will be slowly advanced, and there is a high probability that there will be no CP!