Akira, who is still a virgin at 26 years old and has never had a relationship with a woman, secretly blogs on his mobile phone in an attempt to leave a proof of his life. One day on a holiday, he finds out that Kazuya Maeda, a senior from his school days, has run away from home due to debts. That night, Kazuya appears with Mai, Akira's childhood friend, and the three of them start living together.