Silent Blue Anime Details and Episodes When Aoko was four, a meteorite struck her town. It then rained for twenty days straight, and the crater became what’s now known as the Twenty Day Lake.… Series info Watch free DetailsFormatMangaStatusFinishedScore67/100CountryJapan GenresDramaMystery TagsFemale ProtagonistSwimmingAmnesiaJoseiScuba Diving RecommendationsSuiikiNight DiverKanpeki na MachiAoi Uroko to Suna no MachiMrs. Mermaid