Otona no Koi wo Oshiete Kudasai

Iroha is a new employee at a trading company who has never been in love. She is set to enter an arranged marriage but still hopes for her first romantic experience with someone she truly loves. She decides to confess to Kashiwagi, the most popular man at the company. The two agree to a temporary "lover's contract" and begin with a first date. Kashiwagi helps the initially nervous and stiff Iroha ease into the experience. Despite their agreement to only be temporary, Iroha finds herself developing feelings for him.