Prince of Tennis: The Grim Reaper

I could accept transmigrating into The Prince of Tennis, and I could even accept becoming a man, but I actually became Tezuka Kunimitsu's older brother. Most importantly, I arrived before the story began?! What happened to the plot I was promised?! This is depressing… (PS: This is an original story. The protagonist is one year older than Tezuka and the others and does not take part in The Prince of Tennis plot. He starts at Rikkai Dai and later joins U-17. There are tons of original settings. This is a sports story wearing The Prince of Tennis's skin.) (PS: Rikkai still wins the Kanto title sixteen years in a row and the national title three years in a row.)