Seiji Sanada, a 30-year-old wage slave, woke up one morning and had time leaped back to the spring of his sophomore year of high school. Seiji, who had long regretted graduating without confessing to his beloved world history teacher, Haruka Hiiragi, resolved that this time, he’d confess to her. Her response was... An astonishing ‘Okay’?!?!?!?! The...