Yandere Kakusei!! Suterareta Reijou wa Saikyou Koushaku ni Gekiomo Attack-chuu!

Synopsis

On top of being discarded by everyone, Lady Imina has been betrothed to the cruel and terrifying Marquis Oscar. During their first meeting he suddenly draws a sword on her.... and yet Imina somehow falls in love at first sight!? "So this... is what it means to love somebody♥" The supposedly cold-hearted marquis is left flustered!? The strongest yandere's overwhelming love is about to explode...!! (Source: Takeshobo, translated)