At Ikaruga High School, Kotono and Suzuyo watch as Shoichi’s attention turns entirely toward the school doctor Maiko amid mounting pressure over upcoming exams. With expulsion a real threat, Maiko draws him into a risky plan to enter the principal’s office and secure the examination disk. Their mother Kasumi continues her duties as trustee chair, while the sisters grapple with divided loyalties and shifting affections within the school’s tense atmosphere.