Kuroko ni Koi wa Irimasen 4 (Flower C Alpha)

[Machine Translation] Ex-boyfriend x Brother-in-law x Adultery! The four-way relationship is complete! Satoko was traumatized by the rejection of her high school boyfriend, Mr. Gou, and became a "black girl" who will never fall in love again. She becomes a teacher and returns to her old school, but finds herself in love with Gou's brother-in-law, Aoi. However, Gou's wife, Yuriko, returns to Japan after living abroad and finds out that Satoko is with Gou. Satoko also sees Yuriko, and her heart begins to shake with memories of Gou...! And the truth behind Gou's rejection of Satoko is finally revealed! Gou and Satoko's smoldering feelings, Yuriko's violent act, and Aoi's decision... The tense love story of the four-way relationship is finally complete!

元カレ×義兄弟×不倫！？四角関係・完結！高校生の頃付き合っていた豪先生に振られたトラウマで、二度と恋はしない「黒子」となった里子。教師になって母校へ戻るが、豪の義弟・葵と両想いに。しかし、豪の妻・百梨子が海外生活から帰国して、里子が豪の側に居ることを知ってしまう。里子も百梨子の姿を見て、豪との想い出に心が揺れ始め…！？そして豪が里子を振った真相がついに明らかに！豪と里子のくすぶる想い、百梨子の凶行、葵の決心…緊迫四角関係ラブ、ついに完結！