I, Hikigaya, Carry My Old Sword with Me

(Campus, slow-burning novel, magically modified plot, multiple female protagonists, super slow pace, the characters seem occ, I guess...) (You must be a strong person if you dare to look at it with your brain) When Hikigaya was in fifth grade, his parents died in a car accident. The dog who hit someone relied on his power and power to clear his name through connections. His younger sister, Hikigaya Komachi, was hospitalized due to a car accident and needed surgery. He sold his house to not be able to pay for the surgery, and was eventually forced to gamble in an underground casino. However, when he was about to leave after winning the money, he was cheated again. At the critical moment, he was rescued by a mysterious man at the cost of three years of hard training in martial arts with him. Three years later, he brought Hikigaya Komachi back to Chiba. Based on his grades, he was admitted to Sobu Junior High School in Toyoshichi. He originally thought he could live a stable life, but on the first day of school, he was targeted by Yukinoshita Yono...