SCISSOR SEVEN SEASON 4

Wu Liuqi originally lived a carefree life on Xiaoji Island, but his identity remained a mystery because of amnesia. As an outsider arrives and recognizes Wu Liuqi, various conspiracies begin to envelop the Island. In order to protect his friends and their home, Wu Liuqi decides to return to Xuanwu to face his destiny. (Source: bilibili, translated) — Description from AniList community (anilist.co).