Honkai Impact 3Rd - Gratitude Arc summary:

The story related of Book 1005, and directly related to book 1002.) There was an anomaly on the back of the eight-fold cherry blossom Stigmata of Theresa, which caused Teresa to fall into a coma. In order to wake up her. Mei entered the data space inside that mysterious stigmata to investigate the cause of the anomaly. Inside dataspace time, "SHE" was also appeared in front of Teresa who was enclosed in the sacred space...