This study designs an interactive serious game for children with ADHD to sustain attention concentration and improve their reading comprehension skill. This serious game enables to read fairy tale interactively. The fairy tale consists of 6 sequences and the game assigns tasks for concentration training to 2, 4, 5, and 6 sequences. Executing concentration task, MindWave BCI is used to measure brain waves and to judge success of failure of the task with that measurement. Game play data and concentration data were stored in a sever real time. As the experiment progressed, the concentration levels of the participants are sustained stable. The results of paired t-test on pre- and post- reading ability, short reading comprehension, and story understanding are significant. It is expected that this study will help game design for children with ADHD as well as reading disability.