I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too 10 (Fujimi Fantasia Bunko) [Light Novel]

[Machine Translation] Yuya Tenjo, who has brought peace to the universe after winning the turbulent interstellar war, is now back in peace after a long absence. For the first time in a long time, a peaceful everyday life has arrived, but there is no way that the whole world will leave Yuya, who has become a living legend, alone.... Meruru, an alien girl who was saved from a crisis on her home planet by Yuya, has unexpectedly transferred to Ousei Academy! Unaware of the certain mission she has to take on, Yuya challenges her to the school's big event, the sports festival...? At the same time, an evil cult is active in the other world that is hostile to Yuya. Yuya is transported through time and space by their scheming, and encounters- ( Why do you have that sword too? ) ( That's... "All swords" ! ) The "Sage" who gave him his entire inheritance! Everything is connected in the past!

激動の星間戦争を無双し、大宇宙に平和をもたらした天上優夜。久し振りに平穏な日常が到来した―かと思いきや、生ける伝説と化した優夜を、全世界が放っておくはずもなく...。優夜に母星の危機を救われた異星人の少女・メルルが、王星学園にまさかの転入!彼女が背負うとある任務の存在も知らぬまま、優夜は学園のビッグイベント・体育祭に挑むが...!?その頃、異世界では優夜を敵視する邪教団が暗躍していた。彼らの謀略によって時空を飛ばされた優夜が出会ったのは―「なぜ、お前もその剣を持っている?」「それは...“全剣”!?」自身に全遺産を授けた“賢者”!?すべてが繋がる過去世界編!!