"Ryohei Sekoguchi is a prominent character in the manga ""A Marriage for Sale."" He is introduced as a successful businessman and the CEO of Sekoguchi Corporation. Ryohei is the son of a wealthy family and has always been seen as a desirable bachelor. His good looks, charm, and wealth make him the envy of many.

Ryohei's character is portrayed as aloof and detached, but his actions show he is deeply caring. He is looking for a marriage of convenience to help his company's merger and consolidate his power. Ryohei wants to save his family's company from a hostile takeover by a rival firm, and he is willing to do whatever it takes to achieve that goal.

Throughout the story, Ryohei is warned by friends and family not to treat marriage like a business transaction. His lack of experience with relationships is highlighted, but he is determined to learn from his mistakes.

As the story progresses, Ryohei is shown to be a complex character with many layers. He is still the successful CEO, but his soft side is revealed as he becomes emotionally invested in his wife. Ryohei's actions to help his wife show his true nature, and he proves to be a loyal and supportive husband.

Overall, Ryohei Sekoguchi is a fascinating character in ""A Marriage for Sale."" He is ambitious, successful, but also caring and empathetic. His journey throughout the manga shows the transformation of a man who thought he only needed a wife to save his company but ended up finding true love."