Ikemen Sengoku: Romances Across Time

You have just landed your dream job as a fashion designer when you are thrown back in time to an alternate version of Sengoku era Japan. Your arrival immediately changes history: you save Nobunaga Oda from being killed, and Nobunaga remembers it. Now you have three months to survive the most turbulent period in Japanese history, surrounded by famous warlords who are considerably more attractive than the history books suggest, before the next window to return home opens. Someone's heart might become an obstacle before then.