46岁的天野光彦某天突然回到了16岁的状态。被裁员的同时又面临离婚，前路一片黑暗之际却察觉到自己回到了16岁。天野光彦与现在的妻子幸子在高中时代并无交集。时间追溯到1986年，他在初恋小沢皋月还有妻子幸子两人中踌躇不定，一边陷入不良学生的争斗，一边学会了成人的消遣。人们从未经历过的“第二次青春”的故事即将上演。

講述的是被妻子提出離婚，也被公司裁員的中年男子天野光彥，穿越時空回到了1986年的16歲高中生，並以46歲高齡度過第2次高中生活的故事。

劇中除了許多80年代的流行音樂播放外，還出現了令人懷念的盒式錄音帶、80年代流行的時尚、流行語。作品名的“HIGH POSITION”是以高音質為特徵的高級卡式錄音帶的名稱

Mitsuhiko Amano is full of regrets. A 46 year old salaryman who had just been laid off, he was told that his wife wanted a divorce, something that he might have been wanting for years. So he visits a soapland, a place he hasn't been since he started dating his wife 22 years ago. While there, a fire suddenly erupts, trapping Amano and a soapland girl in the bath. In a rare moment of bravery and decisiveness, Amano attempts to lead the girl to safety, only to slip and hit his head. As his consciousness fades, he sees the back of the soapland girl making her escape... A fresh set of regret blankets him as he passes out, he returns to his 16-year-old body while remaining 46 years old. The time is 1986.