From a chance encounter due to fallen underwear, Ise and Hishimoto are now dating. Since moving in together, both work and private lives are being lived to the fullest. However, Hishimoto starts to get busy at work, and opportunities to spend leisure time with his lover gradually start to disappear...! From the wildly popular “Koi ga Ochitara” comes the long awaited sequel!

Hiroharu is living a pretty good life. He has a stable job, and he's happily in love with his boyfriend, Natsuro. To make things even better, now that it's the moving season, Natsuro proposes that he and Hiroharu move into a bigger place together. But everything comes to a heart-stopping halt when Hiroharu runs into his ex-boyfriend, Kazuaki. The two of them dated five years ago before Hiroharu broke them up, and after Kazuaki invites him out to eat, the memories come flooding back. Before he knows it, he's having sex with Kazuaki and craving him all over again. Hiroharu vows that it's only a one-night-stand, but then he finds out Kazuaki is his new neighbor…!

Brooding alone in a nearby park, Natsurou’s only companions were his regrets and painful memories of love… until a voice rang out to rouse him from his trance. The owner of the voice was the stranger Tsuyuhiko—a boy who bore a striking resemblance to his former lover. The intriguing youth took pity on the forlorn Natsurou, and he found himself responding to Tsuyuhiko’s coaxing without a fight. Following him home, Natsurou allowed himself to be swept up and drowned in pleasure, taking the stranger’s offer to use him as a substitute and embrace him as if he was his former lover. Though their tryst was only meant to be for a single night, Tsuyuhiko gave him an innocent smile and made a promise to meet again—Natsurou realized something changed inside him. However, it appears his young paramour has some worrisome tendencies… A heartbroken civil servant and a soft boy with troubling propensities. This “how to love” romance will slowly teach them about love and affection.

Harehito and Oujirou are trash collectors. Harehito's hands can fix anything, like magic. When Oujirou's heart is broken, Harehito's hand, warm on his back, brings him to life. Once again, a request comes in to pick up a dormant boy. It's another sweltering day. Just like the day Harehito "collected" Oujirou as trash.

One night, right after he was dumped by his boyfriend, a pair of underwear came falling down upon Ise's head. The one who dropped it was a man named Hishimoto, whom Ise couldn't seem to ignore – and they end up working together to bring in the laundry that had fallen onto a tree outside his window. After being told by Hishimoto that he would like to thank him, Ise goes up to his place. There, he is told that Hishimoto has been thinking about him, and that he had used the fallen laundry as an excuse!