Three years ago, Yuuki was summoned to another world, Dinia, which was being attacked by the forces of the demon lord. Even though he was merely a normal student, he gained great powers and they soon called him the ‘great wise man’. After helping the hero Scana take down the demon lord, he was been unable to return to his own world. They had fallen in love during the difficult journey and promised to marry each other, but they were separated due to the underhanded scheme of some corrupt nobles. For his great achievement, he was ultimately rewarded with only disappointment and despair. After getting revenge against the nobles, he longed for the lost school days as a normal student. He wanted to just spend relaxing days with his friends. If he couldn’t return to Japan, then at least he wanted to experience it here. With that wish, he found himself standing in front of the school gates. He was excited to start his new school life, but his homeroom teacher was the kingdom’s second price Hylen, while the first princess who had summoned him to this world, Flowra, was one of his classmates. One by one, people who he partied with or met along his journey appeared by his side once more. Then, Scana re-appeared before him, declaring that she would give everything to him while kissing him in front of everyone.