Tsumugu is a gay university student who has a deep love for shoujo manga and romantic daydreams. He works part-time at a rental shop, where he becomes friendly with a regular customer named Keisuke. Through a series of casual encounters, Tsumugu accidentally reveals his sexuality to Keisuke. Instead of reacting with prejudice, Keisuke accepts him without judgment, and Tsumugu finds himself increasingly drawn to him. However, Keisuke carries a secret that sets him apart: his saliva has an unusually sweet taste and a peculiar effect, a trait that has shaped his relationships and self-image. As Tsumugu and Keisuke grow closer, they navigate the challenges posed by Keisuke’s condition, learning to trust each other and find intimacy on their own terms. The story unfolds in a gentle, contemporary setting, centered on the rental shop and the characters’ everyday lives. Its narrative arc moves from accidental exposure and growing affection to the gradual revelation of Keisuke’s secret, concluding with a resolution that embraces both acceptance and a touch of unexpected warmth.