Aiso ga Tsukinai

They love each other, but they're ex-boyfriends. Hiiragi and Kyosuke have been dating for ten years. They're not living together yet, but their love is going smoothly. They make plans to have dinner together to celebrate their tenth anniversary. However, Kyosuke has to cancel at the last minute due to work. Enraged, Hiiragi, saddened that Kyosuke doesn't cherish him, breaks up with him, and their relationship takes a turn for the worse. What will become of these two ex-boyfriends?