Unfortunate Fall

"Kira? What are you-"
Kira covers Rantaro's mouth before he could say another word. Kira's arms were wrapped around Rantaro's waist pulling him close so that Rantaro's ass was pressing against him.
"Your so pathetic and weak~ I can't wait to break you so much that the only thing you can say is my name only~"
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From an early age, Kira and Rantaro promised that together we would save the world from troubles. Kira did not betray this significance, but Rantaro held this belief for many years.
But who are they to each other?
Kira and Rantaro are childhood friends, but there is a difference in age, as well as in height. Rantaro considered Kira a close friend, just like how Kira saw Rantaro.
Kira was quite close in communication and in fact needed each other.
But time passes, Rantaro leaves for another city, and Kira become a villain, or rather .. in two years, Kira has become a wanted villain who is ready to go over the heads for the sake of the goal.
The green-haired one arrives, the look has not changed, but he became a hero. And one goal is needed for the increase .. for him to find and catch Kira.
Time passes, Kira stands with a gun and shot at one of the rich man. Kira laughs when his blood gets on his clothes. Kira says that it's time to leave, but that person whom Kira did not want to see enters the hall of corpses.
- Kira remember our promise? We promised each other that both would be heroes. What now?
Rantaro is holding a gun, what is his trick? Rantaro knows a little about the future and is good in physical form. The room was on the 20th floor with a lot of windows, Kira can easily leave, but is this a chance for him to talk to an old friend?
But there is one but.. your goals are different. Kira's goal is to take everything precious with him, and Rantaro, put Kira behind bars, and in the worst case, kill Kira.