of the company. He also designed the training system “E.P.I. Training”. On March 30, 2012, it was announced that he would play his first leading role in the drama Kimi to Boku to no Yakusoku (君と僕との約束; Promise Between You and Me) alongside fellow Exile member Keiji Kuroki. On July 1, 2012, Tetsuya joined the Exile sub-unit Exile The Second alongside his fellow former Nidaime J Soul Brothers members Shokichi, Nesmith, Keiji and Kenchi. In August of the same year, he was appointed as a lecturer for NHK-E's program E Dance Academy together with Exile's Üsa. It would serve as an educational program for amateurs interested in dancing and include dance lessons with children who are elementary school students and dance beginners. The public response to E Dance Academy was great, including being actually used as a reference in school classes. For this reason it was decided to become a regular program. In 2013, he participated in Üsa's DANCE EARTH project by being part of the coed unit Dance Earth Party as a performer. On April 29, 2015, Tetsuya became a fixed member of Dance Earth Party alongside Üsa and Dream Shizuka. On December 28 in the same year, it was announced that he would undergo surgery on his left shoulder in early 2016 due to a joint dislocation. On October 6, 2016, he was appointed as a "Yokosuka Excitement Ambassador" alongside Kenchi Tachibana. Both being Yokosuka locals, they remained strongly attached to their hometown even after joining Exile and continuously contribute to the development of the children of the city. In the same year, Tetsuya became a visiting associate professor at Mimasaka University to examine the impact of dance on children. On March 26, 2018, Tetsuya graduated from Waseda University Graduate School of Sports Sciences with a master's degree after completing a one-year master's program. He published his master's thesis on the theme of "The present situation and prescription of modern rhythm dance classes at junior high schools after the mandatory education ~Class design and auxiliary video teaching materials for students who enjoy and teachers who have difficulties in teaching~". His master's thesis won the Excellent Paper Award of his university. On December 4 in the same year, all Dance Earth Party members announced the group's indefinite hiatus. Tetsuya would go on with his activities as a member of Exile and Exile The Second. On May 13, 2019, it was