Silverlink

SILVER LINK (株式会社シルバーリンク) is a Japanese animation studio. It was founded by ex-Frontline animation producer Kaneko Hayato in December 2007 and is based in Tokyo.

After the company’s establishment in 2007, Oonuma Shin, who was previously a director alongside Shaft directors Shinbo Akiyuki and Ooishi Tatsuya, joined the studio. A majority of Silver Link’s productions have involved Oonuma as a director or co-director since his joining of the studio. The company had also owned two subsidiaries: BEEP, a subcontracting animation studio, and CONNECT, a studio that started off co-producing series with Silver Link, and has since expanded into producing its own works. Both subsidiaries have since been dissolved by the studio, though they both still continue to operate as divisions within the company.
*wikipedia

After the death of Himenokouji's parents, Akito and Akiko were forced to live with separate families for six years. They finally manage to find each other and start living together. It quickly becomes apparent that Akiko has romantic feelings for her older brother, but Akito sees her only as a younger sister.