I Kept Pressing the 100-Million-Year Button and Came Out on Top, Vol. 8 (light novel) — Syuichi Tsukishima

WELCOME TO CHERIN -- THE LAND OF SAKURA AND SWORD FIGHTS!After saving Shii from a political marriage and surviving a turbulent Valentine's Day, Allen and his friends are off to Cherin, the Land of Sakura, for their spring training camp! There, with his head full of romance and cherry blossoms, he's almost cut down by an incredibly powerful drunkard…who turns out to be Rose's grandfather, Bacchus Valencia! Once touted as the world's strongest swordsman, Bacchus knows all about Transcendents and the Time Hermit, and decides to take Allen's group under his wing. Their days pass in a blur of intense training and relaxing in hot springs, but an ominous shadow approaches…