Koroshiya Yametai!

Rose became an assassin to survive as an immigrant refugee. Her lover, Benika, is an ordinary schoolgirl, who wanted to keep their homosexual romance hidden from her father, a priest at the church where Rose goes to confess her sins of murder. Rose's employer, the "Organization," is also on the move, as Rose's personal and professional relationships are about to get very, very messy!?!

(Source: Comic Days, translated)

Note: Chapter count includes one epilogue and five omake chapters.