Riichi Ueshiba (aka Reach Ueshiba) is a Japanese manga artist born September 4, 1969 (age 48).
He has written and drawn Yume Tsukai (Dream User) and Nazo no Kanojo X (Mysterious Girlfriend X), which are finished projects. These manga were also released as anime series. Another of his works, Discommunication, had its main characters animated in the 14th episode (OVA) of Mysterious Girlfriend X.
Ueshiba's went quiet after concluding the manga for Nazo no Kanojo X. Since Riichi does not use social media platforms (or even a blog), it is unknown whether or not he retired from creating manga altogether.