In the 2017 season, Bahia featured in the first team as centre–back position, starting the season well, going the first five league matches without defeat in the J2 League. However, in a 1–0 loss against Oita Trinita on 22 April 2017, he was sent–off for second bookable offence, receiving a red card at the last minute. After returning to the first team from suspension, Bahia then played a role when he assisted Naoki Yamada to score the winning goal against Matsumoto Yamaga. Between 10 June 2017 to 25 June 2017, he helped the side earn three clean sheets, all of them were wins for Shonan Bellmore. Then on 16 July 2017, Bahia scored his first goal for the club, in a 2–0 win over Tokyo Verdy. Between 16 August 2017 and 26 August 2017, he, again, helped the side earn three clean sheets, two of them were wins for Shonan Bellmore. Bahia then scored two goals between 9 September 2017 and 16 September 2017 against Kamatamare Sanuki and Renofa Yamaguchi. He then helped Shonan Bellmore win promotion back to J.League 1 after a 1–1 draw against Zweigen Kanazawa on 29 October 2017. At the end of the 2017 season, Bahia went on to make thirty–nine appearances and scoring four times in all competitions. For his performance, he was named J.League 2 Best XI, along with Yota Akimoto.