@Aretheus There is any other kunoichi named Tsubaki? I can't find one. It is common to name girls after flowers in the old days (all the girls in this manga are named after flowers) so Tsubaki was a pretty common name since it means Camellia, a flower that was popular with people and in flower language, it means "love".
@miyako19 I'm not sure if it's just me because I have safesearch off on Google but when I tried to look up this series before, the first result was an h-game on Steam.