S01E01 Pilot
Locked out, 30yo Natsuki is helped by 25yo Sôichirô. Natsuki's marriage intro goes awry, but Sôichirô comforts her, takes her up in a plane. Back at Haruko's, she introduces to Natsuki and Fuyumi her brother,...
Everyone panics when it looks like Fuyumi tried to kill herself. Kuga patches her up. Sô-chan says he'd break off with someone he couldn't make happy, and Natsuki agrees. A drunk Fuyumi kisses Kuga. Natsuki gets angry, and storms off, but Kuga goes after her, and kisses her for real. Natsuki calls home. Sô-chan answers, and finds out she is with Kuga, and won't be coming home.
29-year-old Natsuki bumps into 25-year-old Sôichirô while on vacation in Hokkaido. Back in Tokyo, Natsuki discovers Sôichirô is her friend Haruko's younger brother, and they all end up living together along with Fuyumi, a third friend. Natsuki and Sôichirô form a strong bond, but become involved with other people all the while wondering who they should be with.