Daiki is a former playboy who used to view sex as a casual, pleasure-driven activity, often not even remembering his partners' faces. That all changes when he reunites with Kanade, a quiet and composed former classmate from high school. Falling genuinely in love for the first time, Daiki finds himself completely devoted to his new boyfriend. The two begin a blissful, sweet relationship filled with dates, hand-holding, and cooking together. However, they are confronted with an unexpected obstacle: despite their deep emotional connection and mutual desire, they have been unable to successfully consummate their relationship.

The central conflict arises from Daiki's earnest, almost desperate wish to give Kanade a painless and wonderful first time. Daiki is significantly larger and more physically imposing than the smaller-framed Kanade, and he becomes paralyzed by the fear of hurting his beloved partner. This anxiety causes him to hold back constantly, prioritizing Kanade's comfort over his own desires. Paradoxically, his insistence on a perfectly pain-free experience creates a barrier, as Kanade begins to feel frustrated and guilty, wondering if he is somehow inadequate or if Daiki does not truly want him. The story follows their journey as two people, deeply in love but with mismatched experience and physicality, strive to overcome their insecurities and fears to finally achieve physical intimacy on their wedding night.

Set against the backdrop of their everyday life as a couple, the narrative explores themes of acceptance and personal growth. Daiki was raised with a rigid, traditional expectation of masculinity that forced him to hide his true interests. His past as a promiscuous womanizer is contrasted sharply with his present vulnerability, as he transforms into a sincere and almost overly cautious lover. Kanade, despite his cute and petite appearance, possesses a strong, unwavering personality and a pragmatic outlook on life, instilled by a supportive mother who encouraged him to be true to himself. He does not want to be treated as fragile and is determined to close the physical and emotional gap between them.

The story progresses through their repeated attempts and failures, each time revealing deeper layers of their pasts and insecurities. A major emotional arc focuses on Daiki learning that true intimacy is not about technical perfection or entirely removing risk, but about trust and mutual vulnerability. Kanade, in turn, must learn to clearly communicate his own needs and desires, pushing past his guilt to reassure Daiki of his consent and eagerness. Their journey culminates not just in a successful physical union, but in a profound emotional breakthrough where they fully accept each other, scars and all, finally achieving the pain-free and loving first night Daiki had always promised.