Rina Inou

Rina Inou ( 伊能 理奈 Inou Rina) is a secondary character in Summer Radish Vacation.

Information
Rina was the fourth and youngest daughter of Kagura Inou and Tomaru Sawagoe. On the day of her birth, her sister Hajime, who at the time was also pregnant by Tomaru, gave to birth a daughter, Rio. However, as Hajime was very young and her body was not developed enough, she died during childbirth. Kagura had since ended her relationship with Tomaru and raised Rio alongside Rina.

Summer Radish Vacation!!
She and Rio are presented to Shun during the welcome party for Shun and Mai.

After Summer Radish Vacation!!
She presumably was taken away by Tomaru together with Rio.

Summer Radish Vacation!! 2
She is mentioned briefly by Rin when she talks about her family, mentioning that Rina is dead.

Etymology

 * Her given name Rina ( 理奈 ) consists of "principle" ( 理 ) and "how" ( 奈 ).
 * Her surname may also reference Tadataka Inou, a cartographer known for completing the first map of Japan, OR Kanori Inou, an anthropologist known for his studies in Taiwanese Aborigines.

Trivia

 * Her seiyuu, Sayaka Aoki, also voiced Rina's great^2-grandniece, Rika Inou, as well as Yuma of Imouto de Ikou!
 * It is unknown what caused Rina's death, but given what happened to Rio and Hajime, it's quite likely that she too died in childbirth.