Rubus croceacanthus H.Lév.

Family: Rosaceae
Japanese: オオバライチゴ (大薔薇苺) [Ōbara Ichigo]

I'm about 95% sure I have identified this species correctly but there are one or two similar species. According to [Yoshikane I., Minoru A., Misako M., Naohiro N. Cytogenetic Relationship between Rubus croceacanthus and R. minusculus (Rosaceae). CYTOLOGIA.Vol. 61 (1996) No. 2:163-167.], there is no difference in genome between R. croceacanthus and R. minisculus, but I'm not sure about R. okinawensis. The leaves tend to be reddish-greenish. The edible fruit is red.

References:
九州野山の花 片野田逸朗,2004：南方新社
米倉浩司・梶田忠 (2003-)　「BG Plants 和名－学名インデックス」（YList），http://ylist.info（ 2019年8月14日）
Yoshikane I., Minoru A., Misako M., Naohiro N. Cytogenetic Relationship between Rubus croceacanthus and R. minusculus (Rosaceae). CYTOLOGIA.Vol. 61 (1996) No. 2:163-167. From https://www.jstage.jst.go.jp/article/cytologia1929/61/2/61_2_163/_article