Marumo no Okite SP (2011)

Marumo no Okite SP 2011 / マルモのおきて　スペシャル 2011 / Tradition of Malmo

The story is set during the children's summer vacation, and the three main characters take a trip to a vineyard run by Marumo's college underclassman. There, Kaoru and Tomoki meet another child around the same age and resolve a conflict between the child's parents. (Source: Tokyograph)