Boku no Heya ga Dungeon no Kyuukeijo ni Natteshimatta Ken

Suzuki Touru has just scored an amazingly cheap apartment–but the reason it’s so cheap is the front door opens up to a classic fantasy dungeon! Luckily, Touru has always wanted to explore a dungeon. But when he stumbles across Ria, a beautiful blonde knight, he may well have gotten more adventure than he bargained for!

(Source: Seven Seas Entertainment)