Yuminami was born in Chiba, Japan to Wakako and Shinichi Yuminami.[1][2][3] He started playing basketball at the age of three as an influence of his father who was then coaching an elementary school basketball team.[4] When Yuminami was nine years old, his family moved to the United States and settled in Huntersville, North Carolina. At the time, he could not speak any English.[2][5][6] He attended J.V. Washam Elementary in Cornelius, North Carolina and cited basketball as the instrument that helped him in making social connections and overcoming the language barrier he experienced.[3]
As a sophomore, Yuminami averaged 13.0 points, 2.0 rebounds, 4.0 assists and 1.9 steals per game,[7] helping the Pride finish third in the Southern Piedmont 1A Conference with a 10–5 record.[8] In his efforts, Yuminami earned the All-Southern Piedmont Conference selection.[9][10]
In his junior year, Yuminami averaged 9.7 points, 2.2 rebounds, 4.7 assists and 2.2 steals per game.[7] Pine Lake finished fifth in the Southern Piedmont 1A Conference with an 8–8 record.[11]
As a senior, Yuminami averaged 8.1 points, 2.0 rebounds, 5.9 assists and 1.6 steals per game,[7] helping the Pride finish first in the PAC-7 1A Conference with a 12–0 record.[12] For his performance, he earned the All-PAC-7 Conference selection.[13] Yuminami also received the PGC Leadership Award from the North Carolina Coaches Association.[14]
Yuminami finished off his high school career as the school’s all-time assist leader.[1][15]
On November 7, 2018, he made his collegiate debut in a pre-season game against Carver College, posting four points, one rebound and one assist in four minutes of action.[16] As a freshman, Yuminami played in eight games, averaging 1.0 points, 0.5 rebounds and 0.1 assists per game.[17]
On December 6, 2019, Yuminami registered a season-high 11 points, shooting 3-for-3 from the field and 3-for-3 from three, in addition to one rebound, two assists and two steals across 10 minutes of play in a 100–70 win over Carver College.[18] During his sophomore season, he averaged 1.7 points, 0.2 rebounds and 0.3 assists over nine games.[19]
On December 20, 2020, Yuminami posted a season-high eight points on 3-for-3 shooting from the field across 11 minutes of action in a win against Carver College.[20] As a junior, he averaged 2.2 points and 0.6 rebounds in five games played.[21]
Yuminami was a business management major at Georgia Southern University. For being able to maintain a grade point average (GPA) of at least 3.5,[24][25] he was named into the Sun Belt Commissioner's List in 2019[26] and 2020.[27][28] He was also named to the Georgia Southern President’s List twice (spring 2019–20 and fall 2020–21) and the Dean’s List thrice (spring 2018–19, fall 2019–20 and spring 2020–21).[1][6]
^"Sport Shorts – Week of 3/18 | Lake Norman Publications". www.lakenormanpublications.com. Retrieved 2021-06-25. Sophomore point guard Eito Yuminami was a first-team all-SPAC selection after averaging 13 points and four assists per game.