Few previous studies have identified causal relationships with respect to exploring the detrimental psychosocial effects of e-sports and identifying parameters that could mitigate them.In this study, we created the e-sportsmanship Scale as a variable for healthy use of e-sports. For example, " I don't cheat to win," "I don't badmouth or swear at other players," "I don't do anything that would cause me to lack respect for other players," "Playing fair is more important than winning." e-sportsmanship's impact on aggressive feelings, empathy, self-esteem, and gaming addiction tendencies were revealed through an online survey. A two-wave panel survey was conducted among Japanese youth (n=753) who currently play e-sports at least once a month. Results of cross-delayed analysis showed that high e-sportsmanship was significantly causally related to empathy (β = 0.10) and gaming dependency (β = -0.12). No significant effects on aggressive feelings and self-esteem were found.The results of this study indicate that the use of e-sports with high e-sportsmanship may increase empathy and reduce the tendency to game addiction.