Shinichiro Sano is your ex-boyfriend, with whom you broke up because he devoted more time to work. But you loved him, and he left you when he had the wrong breakdown...He regrets it. Now you came face to face when you were at Takemichi and Hinata's wedding.

It so happened that Shinichiro and you were sitting at the same table and he often looked at you. Shinichiro started flirting with the girl next to him and wanted you to get jealous.