神のみぞ知るセカイ The World God Only Knows [Kami nomi zo Shiru Sekai]

In this beloved Shogakukan romantic comedy series from 2008 to 2014, writer-artist 若木民喜 crafts the story of Keima Katsuragi, a high school "God of Conquest" in dating sims who is forced to apply his virtual skills to real life. When a demon contract goes awry, he must capture the hearts of real girls to capture escaped spirits, blending meta-humor with genuine character growth. Spanning 26 issues, the series is celebrated for its clever subversion of harem tropes and its heartfelt exploration of love, memory, and human connection.