Outgoing, fierce Rui Hanamine and gentle, soft-hearted Yuujirou Matsukaze have been close friends since they were children. Though they were supposed to be nothing more than best friends, eventually they confessed their smoldering attraction to one another and began dating. Now their days are filled with sweetness, leaving them wondering, "Am I really allowed to feel this happy?"

Now with the end of their time at high school and summer vacation fast approaching, what does the future hold for the love-struck couple? Sometimes sweetness comes with a little bitterness...