Sougiya Riddle, Shinigami Doggy Recommendations
Each is about a boy who is killed. He is given some difficulties by a supernatural being (the Undertaker or Shinigami), who later saves his life....but in exchange, he must work for them.
Have a similar, slightly over-the-top style.
Both Sougiya Ridoru and Shinigami Doggy involve younger boys who get involved in a contract with young men in order to achieve a goal. They both deal with similar topics (undertakers and shinigami) and have slightly dark atmospheres. Also, some of the characters act the same at certain times (Shin's actions towards Ren are sometimes like Riddle's actions towards Hayato).