Kamishiro Ritsu, a highschool student with a height complex, is working hard to rebuild his father’s rundown kendo dojo. Then all of a sudden one day a long-haired boy in a bizarre outfit appears in front of Ritsu and says “I’m an oni! I’ve come to retrieve the Mallet of Fortune from you, the descendant of Issun-Boushi!”
Y2K Gyaru Oni x Straight-Laced Boy in this 2021 version of the “Issun-Boushi’ fairy tale!

Ritsu Kamishiro, a diligent high school student, devotes his days to the restoration of an abandoned kendo dojo. However, he harbors a deep-seated insecurity about his height. One fateful day, a peculiarly attired man with flowing locks materializes before Ritsu, proclaiming himself as a demon. Startled, Ritsu learns that this enigmatic figure intends to reclaim a hammer from him, as he is believed to be a descendant of the legendary One Inch Man. The encounter leaves Ritsu feeling an intense heat and a tightening sensation in his stomach... He finds himself captivated by the man's irresistible allure. (from Not a Scans Group)