Iroha, a member of the Hattori family, whose members have been ninjas for generations, is not doing so well in school and is attending high school. However, her true identity as a ninja is revealed right away at the high school entrance ceremony...!? (Source: Hakusensha, translated)

Once you succumb, it's already over一an anthology about good, earnest girls being bewitched by flirtatious, seductive women.