About the You Are My Happiness Manga Volume 1 (Mature)

A chance encounter at work leads Yokoi down a romantic path with an incubus named Sakuma. Yokoi is your average college student with a slightly unusual job. After class he tends to a food stall in a difficult-to-reach park. His food is hearty and cheap, but he doesn't have a liquor license. One night while working his booth, an unusual customer walks in. Sakuma has a tail and wings and is extremely thirsty. Yokoi offers a meal, but that isn't enough to satiate Sakuma. So when Sakuma offers Yokoi a treat, the college student's life begins to long for something different as well.