The series is mainly about a 27 year old man named Makio Sakaki. His purpose is to become a successor after his father. However, he must pass high school first in order to prove himself worthy in the family for if he fails, his younger brother will take over, instead of him. Through the school years, he faces many obstacles such as righteousness, friendship, and perhaps even love. back to school。偶像般的大叔.（设计搞完,心情不错,撰文抒发一下）。珍惜过往、现在。开始怀念上学的日子。二十七岁的黑帮大爷也能当高中生？。想再读一次让自己无悔的高中。神经大条是种幸福~！。热血的校园故事。回不去的happy day。学校不是一无是处的。 榊真喜男（长濑智也饰）是关东黑社会锐牙会所老大的儿子，肩负着继承会所的重大使命，可是由于他“考虑事物的能力只有前90秒”，稍谈不拢就以暴力解决，好几笔生意都被他搅黄，给组织造成重大损失。 忧心忡忡的老爹于是决定将真喜男送到高中接受一年再教育，尽管有放心不下的小弟和弥（田中圣饰）偷偷跑来“保护”，真喜男在学校里还是闹出了一连串笑话，也因为学习跟不上而被人嘲笑。 还好有热心友善的樱小路（手越佑也饰）和光（新垣结衣饰）的鼓励，真喜男重拾信心，先是当上了班干部，在球技大赛胜利后，他开始渐渐取得认可，通向老大之途呈一片大好之势！
