Sister Mafioso

Under the cover of darkness, Dina Ferletti—the young, golden-haired queen of the fiendish Ferletti family—was tossed into a nearby canal and left for dead. The next day, a redhead with “amnesia” washed up on the shore of a rural seaside town. For the past decade, Dina’s lived the charmed life of a nun-in-training, but her blessings seemingly run out when Teodoro, a member of the family, breaks into the chapel. He’s arrived under orders to bring the don’s little sister home, but Teo’s true intentions lie with bringing the Ferlettis to justice. As a result, Dina’s forced to give him a hand by posing as...herself?! And if she’s discovered, her death won’t be staged this time. So God, please let this lie stand!

(Source: J-Novel Club)