Shi Cao Lao Long Bei Guan Yi E Long Zhi Ming
English title: A Herbivorous Dragon of 5,000 Years Gets Unfairly Villainized
Japanese title: 食草老龙被冠以恶龙之名
Type: ONA
Episodes: 12
Source: Light novel
Genres: Adventure, Comedy, Fantasy
Studios: LAN Studio
Producers: AT-X, bilibili, Kadokawa, Starry Cube
Duration: 13 min per ep
Rating: PG-13 - Teens 13 or older

A 5000-year-old herbivorous dragon was living peacefully when one day a young girl showed up in his cave. She offered herself as a sacrifice in order to gain favor for her village. He played along as the great "Evil Dragon, the Demon Lord's Army Leader" in order to get rid of her. However, his little white lie awoke her hidden powers and his peaceful life suddenly ended.

(Source: MU, edited)