Natsumi uses her transformation powers to impersonate Shido at school, performing various "naughty" or offensive acts to turn his friends and teachers against him.
Tohka and Origami are able to distinguish the real Shido from the impostor, forcing Natsumi to retreat. Date A Live III (Dub) Episode 1
During an AST attack, Natsumi's true form is briefly exposed. Believing Shido has seen her "secret" (her true, insecure appearance), she becomes hostile. Natsumi uses her transformation powers to impersonate Shido