The one-shot centers on Tetsuo Tanba and Misaki Kurogane, two members of the "Japan Angel Federation Sendoff Department" who search for souls who cannot pass on to the afterlife due to lingering regrets, and send them to the afterlife. 

(Source: Anime News Network) 
Note: Published in Weekly Shounen Jump 2002 No.42

The samurai didn't stand a chance. First, the aliens invaded Japan. Next, they took all the jobs. And then they confiscated everyone's swords. So what does a hotheaded former samurai like Sakata "Gin" Gintoki do to make ends meet? Take any odd job that comes his way, even if it means losing his dignity.
 
(Source: VIZ Media)
 
Included Bonus Chapters: 
Volume 1: Dandelion (One-shot). 
Volume 2: Shirokuro (One-shot). 
Volume 24: 13 (One-shot). 
Volume 38: Bankara-san Ga Tooru (One-shot). 
Volume 41: Special Lesson.

Dandelion follows Tetsuo Tanba and Misaki Kurogane, members of the Japanese Angel Federation’s Send-Off Department. Their job? Tracking down restless earthbound spirits and gently guiding them to the afterlife. 

While other angels rush to close their cases, the 21st Division’s Dandelion Clan takes a different approach. Dandelion members Tetsuo Tanba and his leader, Misaki Kurogane, listen to each spirit’s regrets and help them resolve what’s holding them back. They even help a spirit who’s an elderly man running at full speed, desperate to escape. 

The angels themselves are full of surprises. Tanba’s permanent scowl and sharp tongue mask a deeply compassionate nature, while Kurogane is a formidable force — despite her girlish appearance. She’s rumored to have laid to rest the legendary soul of Musashi Miyamoto. 
(Source: Netflix)

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