You Call This Tennis?

He was originally a killer. After retirement, he wanted to live a quiet life and transferred to Youth Academy... To bind and resurrect his system, all he needs to do is play tennis. It is said that there will be a major crisis of alien invasion in the future. Before then, he must continue to hone his skills and defend their planet. Although I don't know why aliens use tennis balls to invade the earth, it's a good deal anyway, haha! System dissatisfaction warning: [Be careful! The danger of this sport is no less than the hail of bullets you have experienced in the past, or even more dangerous! ] Izaki Ryuumi: (thinking)... Okay. The system is very nervous. We must keep an eye on this bloody former killer and prevent him from continuing to do evil. There must be a long way to go! It needs to be serious and cold, and it must draw a clear line with him, just to make a deal! In short, at least as a battle-experienced killer, even if his body has shrunk due to unknown reasons, his talents are still far beyond... Before... Strength: 1 (can barely unscrew the cap of a mineral water bottle) Speed: 2 (the highest single seedling among the values) Physical strength: 0.5 (I walked fifty steps today, which was really good, reward yourself) Mental strength:? Skill: 0 (know nothing) System: (Screaming Chicken) [Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh? How did you survive in a hail of bullets before? ? ] Izaki Ryuumi: Ah... Izaki Ryuumi: (Cheerful) Better luck? Seeing this man beating his relative's Echizen Ryoma for the nth time until he doubted his life, the system was deeply choked. [Hey... He's going to cry. Please comfort him! ! ] Izaki Ryuumi bent down and put his head in: ... Huh, really. System:… Echizen Ryoma: ... Idiot brother! ! ! ! It's: a system that I'm worried about every day x a lucky and invincible host combination! This book only covers tennis and wineries, with tennis taking up the bulk, and the main venue is Qingxue, so it shouldn't be a long novel (lay down) Screenshot taken on 24.8.15 Intention: good attitude