"Iinchou wa Saimin Appli o Shinjiteru" appears to be a Japanese phrase/title roughly meaning "The Class President Believes in the Hypnosis App" (iinchou = class president; saimin appli = hypnosis app; shinjiteru = believes). The appended phrase "extra quality" likely indicates a bonus/extra-quality edition, fan-made content, or a descriptor used in online listings to signal higher audio/video/translation quality.
In the end, Tanaka's team emerged from their collective "dream state," shaken but wiser. The department head, once again, earned their respect for taking responsibility and protecting them from the app's dark influence.
Adult, School, Hypnosis, Brainwashing (thematic), and Ecchi.