Yuukai Kon 

Kasuka and her father are trying to hold on to their small coffee shop against redevelopment. When her father was hospitalized for the stress, Kasuka was kidnapped by the heir of the development company and locked up in his apartment. He doesn't just want Kasuka's land, he wants her to marry him, too! Note: Includes the one-shot "If no Sekai (Ifの世界)".