The Phantom Thief's Youthful Romantic Tale is Absolutely Free of Chuunibyou (middle School Syndrome)!

Nobunaga Hanyu, a transmigrator from China, discovers subtle differences in this two-dimensional world when he resolves to live a normal high school life. The greedy, grinning Tomoya Aki? The ruthless Hachiman Hikigaya? The seemingly nonexistent D-Ta Azusagawa? ... A daily life deviating from its original course, the bewildered heroines. The Phantom Thief of Hearts arrives to set things right! You think I'm here to pick up girls? Sorry, actually I'm here to beat up idiots. (I'm telling the truth, I'm not a chuunibyou.) Note: The heroine is an upperclassman (the real upperclassman).