Haitoku wa Amaku Mushibamu背徳は甘く蝕む ; 背德三角戀 ; Haitoku ha Amaku Mushibamu ; Immorality Affects Softly ; Immorality Undermines Sweetly

Anna, a reporter on sweets, likes Toranosuke, a patissier. She wants to develop her love to him, but his twin brother Ryunosuke always gets in the way. Soon, however, she gets aware that she likes Ryunosuke as much as Toranosuke.