Dormitory 407

Four girls become friends and team up through "Dormitory 407." In the Echo Space, they repeatedly clear instances, lose memories, and face the traumas of reality, gradually drawing closer to the ultimate secret of the Echo Space: it is collecting everyone's lost selves. In the end, the four of them break through the impasse at its deepest level, come to terms with their obsessions, and reclaim the selves they lost.