participate in / take part in / join / attend

the crew of five gods who escorted 瓊瓊杵 (Ninigi) during his 天孫降臨 (Tenson Kōrin, “Heavenly Grandson's Descent”) to rule the earth, including 天児屋 (Ama no Koyane), 太玉 (Futodama), 天鈿女 (Ama no Uzume), 石凝姥 (Ishikoridome) and 玉祖 (Tama no Oya)

someone else's younger sister

富士山: Mount Fuji / (name ふじ + suffix さん) Mr/Ms Fuji

aunt / middle-aged lady

算入: factoring in, including / 参入: coming; visiting

算入: factor in, include / 参入: to come; to go; to visit

sumo, rikishi, unofficial term for a professional sumō wrestler

計算高い: calculating

山脈: mountain range