Tachibana, an unremarkable college student who looks just as plain as he is, works as a bookstore clerk in charge of the girls' manga section. Shortly after starting his part-time job, he met a particularly striking customer, "Mr. First Love," who had a somewhat intimidating appearance. At first glance, he seemed like a scary person, but when he smiled, he was a cute person overflowing with love for girls' manga... Kanade was captivated by this contrast and before he knew it, he had fallen in love. However, even after six months of knowing him, he still doesn't know who he is. Kanade has been restraining herself from prying, thinking it's not right to pry, but he accidentally spots "Mr. First Love" in town! He can't help but follow him...!?

Akira, who will be entering high school in the spring, is suddenly introduced to Minato as her fiance by her father, a company manager. Minato is adamantly opposed to the engagement arranged by his parents! But he decides to live with Akira for a limited time, on a trial basis, for a year! "I have no intention of marrying you," Akira declares. What will become of his engagement? A bittersweet love story about a man who gradually discovers love in pursuit of a happy marriage.