It's Called Livlaster

Assisted by the hacker Akari Yomatsuri, Daichi successfully repels the Kill-T-Gang's attack and after returning to Earth, he reunites with Teppei and Hana Mutou, a mysterious girl both Daichi and Teppei met during their childhood. Enraged with the inhuman treatment given to Teppei and Hana, Daichi decides to do something about it.