The New Prince of Tennis: Kintaro Toyama's Cousin

Time travel + tennis + useless counterattack + invincibility + slap in the face + multiple heroines + pretending to be a pig and eating the tiger + scheming + boss In 996, the social animal Echizen Kaito died suddenly, and he traveled to the world of the Prince of Tennis. Toyama Jiro, who was under the care of others, had his parents disappear since he was a child. He took his frail sister to live with his cousin Kintaro Toyama's house, and was bullied by him for a long time. After activating the tennis waste system, he started a counterattack and unlocked skills such as backspin volley, outspin serve, volley ball A/B, and selfless state (elementary level). From defeating Kintaro to get rid of bullying, to winning over Sato Aoi and Kenya Shinobu to build confidence, to a street tie with Echizen Ryoma, to being mentored by Echizen Nanjiro, to meeting Genichiro Tatekai Osanada at work, to saving Sato Aoi to warm up his relationship, the protagonist's strength has steadily increased, but he has also been crushed by Toyama Shigeru (Kintaro's father, a retired professional player) and Nanjiro, and he has recognized the gap in strength. On the eve of the school trial, an unexpected turn occurred - when Kintaro was being tortured by his father, he was unwilling to lag behind the protagonist and used his late-stage ultimate move "Super Invincible Absolutely Delicious Big Wheel Mountain Storm" in advance to knock out Shigeru Toyama. Kaito, who has been counterattacking all the way, encounters changes, and the trials are full of suspense as he is surrounded by powerful enemies.