This is the reborn au where Sanemi and his brother Genya are police officers, and Giyuu is a college student with Sabito, and his older sister Tsutako takes care of Giyuu

Sanemi and Giyuu weren't mostly two people who would talk a lot, but Sanemi knew Giyuu's sister well, so he knew who giyuu was he just hadn't met him

One day, the police and ambulance were called because of an incident in the collage where giyuu studied at Someone had kind of lost control in a fight fight Sabito, and when giyuu tried to break down the fight, he got attacked multiple times by the guy and had serious injuries because the guy used scissors

A few medics and Sanemi and Genya walked into the collage, Sabito was sitting next to Giyuu trying to help his wounds until the medic came, but when did he had to step asides and Genya had to talk to Sabito and the other guy. Sanemi was looking around until he looked over at Giyuu, and he seemed somewhat familiar, so he walked over to him and knelt down.

"Hey... I couldn't somewhat help, but are you perhaps related to Tsutako Tomioka?"