SHADOWS HOUSE 2ND SEASON

After finishing their "debut," Kate, Emilico and three other pairs who started with them begin a new life as adults. With the mystery of the "Shadows House" still unsolved, a new incident occurs in the children's wing. Kate and Emilico, whom the Star Bearers suspect of being malcontents, investigate a mysterious robed Shadow who may be the culprit. (Source: Anime News Network) — Description from AniList community (anilist.co).