The Saint Who Saves the World Is a High School Senior

[2021.07.25] I'm an unremarkable high school student. More precisely, I'm about to start my senior year. That summer, as I was moving from sophomore to senior year, a group of people knelt before me, weeping bitterly. "Holy Son! Come with us and save the world!" I felt sorry for them, but there was nothing I could do. Sorry, I only have fifteen days of summer vacation, and I still have sixty practice exams to finish. I'm terrible at school, and my foundation is weak. If I don't work hard this summer, I'm done for! Everyone waved their hands. "No big deal! The Demon King who's going to destroy the world will tutor you!" Me: ??? So I arrived in the cultivation world and became the Confucian cultivator ancestor's lackey. The ancestor was on the verge of ascending to immortality, but he had inner demons and was going berserk. As his lackey, I had to recite classical poems with him every day. He drew me into his arms and murmured, "Though I do not go to you, why do you not come to me?" Great, I've got my Chinese tutoring! So I arrived in a Western fantasy world and became the substitute hero for the Elf King. I practiced all kinds of optical magic with him every day. He was pining for someone he couldn't have, while I was absorbed in my studies. It turned out the magical world was the real paradise for studying physics! Beneath the Tree of Life, he pulled me into the sacred spring. Beneath the reflection of the light, he asked, "Say it out loud. What's the speed of your voice?" Great, I've got my physics tutoring! And then I arrived in... Anyway, there are seven worlds and seven subjects. The main point is romance, so this isn't something you can use to study. Sliced-up gong x scholastically hopeless shou The blurb is for reference only; the actual story may differ. Theme: At the end of logic, there is love