Toshishita Onzoushi no Shuuchaku Kon: Wakeari Elite no Kiken na Dekiai

"Ah, how pure. After all, you are the only one for me..." Unemployed and with no relatives or boyfriend, Ichika is all alone in the world. One day, she suddenly finds herself marrying her childhood friend Ryo, the heir to one of Japan's leading companies. When she sees him again for the first time in years, it seems he had some something happen in his past. Touched by Ichika's honest kindness, Ryo begins to open up to her, but his love for her gradually becomes abnormal... the story of an obsessive, doting younger man and a cheerful, innocent woman in her thirties; a complicated married life! (Source: Ride-On, translated)