Comet Lucifer
The story takes place on the planet Gift, where precious crystals called Giftjium are buried in the earth. A young man named Sōgo lives in Garden Indigo, a prosperous mining town. Sougo's hobby is to collect rare crystals. One day, he gets wrapped up in a riot caused by his classmates Kaon, Roman, and Otto, and he loses his way until he finds a lake deep under the ground's mining ruins. There, he meets a mysterious girl with blue hair and red eyes that gaze straight ahead. The story follows the adventure of what happens after this meeting.
(Source: Anime News Network)
Episode 1 - The Boy and the Vast Land
Episode 2 - Under One Roof
Episode 3 - Garden Indigo
Episode 4 - Storm
Episode 5 - Souls Come Together
Episode 6 - Flower Boy
Episode 7 - Place of Warmth
Episode 8 - Path
Episode 9 - The Feelings That Must Be Conveyed
Episode 10 - The Alter of Abyss
Episode 11 - The Fallen Angel
Episode 12 - The Boy and the Planet