Gunpla Build Fighters Tri Shippuden

Naruto in his Training trip with Jiraiya was sent to the Gunpla world because of the seal of the Kyuubi loosened instead of Naruto having 4 tails and injuring Jiraiya, Naruto became 5 years old again and grew up with Seikai and Mirai and is a big brother figure to Seikai and the love interest of Mirai and Mirai is Naruto's love interest. Naruto x Mirai