Kurahashi and Matsune had a casual relationship as friends with benefit. One day, Matsune visited a kimono shop where Kurahashi worked with a woman. Seeing Matsune's outgoing manner which was completely different from his usual personality, Kurahashi was delighted and made fun of him. Later, Kurahashi found out that the woman was actually Matsune's matchmaking partner. They continued their relationship after that but Kurahashi grows more fond of him and doesn't want to get hurt by Matsune getting married and they break off - after Matsune realizes how important K was to him, he breaks the engagement off and the get back
Chicken Heart Serenade