Ai wo Shiranai Okumanchouja

Faith's guardian, Stone, has secretly covered her school and living expenses following her father's death. When she discovers this, she resolves to stop him by leaving school and taking a job to repay what he has spent. Stone cannot convince her to stay, so he suggests a deal: he will forgive her debt if she agrees to marry him. He explains that his mother will not transfer her company to him until he is married. Faith is faced with a proposal from someone she cares for, though it is framed purely as a business arrangement.