Ai to Tsumi no Rinbukyoku

Yui Konoma goes to her fiance Kazuki Sakuranagi's house to prepare to be housewife. Kazuki can't be there because he's away for business, so instead, his younger brother Hiroki looks after her. He picks Yui up when she's feeling down about living in such a huge mansion with a family who has countless ruless and traditions. She falls for him, and he feels the same. Then, on a stormy night, they finally cross a line... This series portrays love between two men and one woman, bound together by passion.