In the modern era where humans and non-humans coexist... The protagonist confesses to Elina Tomari, a dark elf senpai he has always admired. Though flustered by the sudden confession, Elina happily accepts, saying, "I've been interested in you too." Yes! From tomorrow, the dreamy lover's life I've always wanted begins... The protagonist, heart fluttering, returns to his lodging. Then, for some reason, Elina arrives with a large bag in tow... It turns out that in dark elf customs, a couple that starts dating must live together. Half excited, half overwhelmed, the protagonist accepts cohabitation with Elina, but... "It's a little hard to say out loud... Dark elves have a... mating season." In the modern era where humans and non-humans alike co-exist, a rich couple life begins with your dark elf senpai in her mating season...!