SSS!

Nadeshiko Otemachi loses her entire family in a terrorist attack. Years later, she enrolls in a military school in Neo Tokyo, determined to protect the city. To escape an awkward situation, she decides to join the S Class, a specialist course reserved for the school's most elite students.

However, the S Class and its S rank members are not what she expects. Nadeshiko soon discovers that the elite program hides secrets and challenges far beyond her initial assumptions, forcing her to confront a reality that tests her resolve and skills.