After the Storm(2007)

Arashi no Ato

Masahiko Sakaki is the head of a furniture import company, happy to be in the casual relationship he's in. He wasn't supposed to fall for his business client, Kazuki Okada... A heartbreaking love story between two very pure adults. Includes a bonus story about what happens after!

(Source: Renta!)

Note: Sakaki also appears as a minor character in Signal, a story set two years prior to the events in "After a Storm".