Recommendations for obscure but excellent manga (with brief reviews)

The following are all manga with low popularity but extremely high quality. Guaranteed not to disappoint:<br><br>1. <i>Dorohedoro</i> — Dark fantasy, a one-of-a-kind world-building ⭐9/10<br>2. <i>Hyouka</i> (Manga version) — Mystery + youth, more nuanced than the anime ⭐8.5/10<br>3. <i>Mob Psycho 100</i> — The original work, which has more depth than the anime ⭐9/10<br>4. <i>The Flowers of Evil</i> (Aku no Hana) — Depressing but incredibly profound ⭐8/10<br>5. <i>Land of the Lustrous</i> (Houseki no Kuni) — Cosmic-level world-building ⭐9.5/10<br><br>Feel free to add your own obscure recommendations!