Mitsuki's Secret Promise Himari has successfully made her debut as an Aipri. However, she realizes that she broke her promise to Mitsuki that they would "debut together" when she was little. On the other hand, Mitsuki, who debuted as the Aipri Mi-chan, is also heartbroken that she broke her promise to Himari. Himari wants to sincerely apologize to Mitsuki, but is warned by the student council that produces Himari that it is a "secret" that she must not tell anyone. Mitsuki also couldn't bring herself to tell Himari. The relationship between the two, who have a "secret," gradually becomes strained...