Trapped within the memory of last summer

The characters here are Kestra(the blond), Mio(the girl) and Thanatos(the man with long hair).
Kestra is Reiner(also blond)'s nephew. He is a famous informant in the area, for his skills and his looks. The man is half German, half Japanese, and is aroung 20 years old in this picture. His original hair color is black, but he started dying it when he was about 15, the platinum blond hair suits him so well that most people mistook it as his real hair color. He also had a little brother named Chronos, whom he considered as his most precious person. However, after being set up by his own uncle, Chronos was shot by a gang's boss and died. At this point, having lost his little brother, Kestra's personality underwent a major change: he started using his natural charisma to get what he wants, and subconsciously got himself involved in countless dangerous situations that would allow him to work more efficiently (which is exactly what his uncle wanted).
Kestra is somewhat trapped within his own past, even after Chronos' death, he still uses the present tense when talking about his deceased brother.
Kestra is bisexual. The two in the pic are his current(but not official) lovers.(Mio looks small but she is already 18). Kestra considers them as precious and important, however it is unknown whether he actually loves either of them.
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Mio is the head of a yazuka bloodline(Japanese mafia family). Thanatos is currently serving her as an adviser and personal guardian. Their relationship is rather complicated.
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Kestra, Chronos, and Thanatos are not their real names, they are merely fake names they use to work with people from the underworld. These three used to share a bond similar to brotherhood when Chronos was alive.
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The picture here depicts the summer one year after Chronos' death. In the background is some sort of illusion created by Kestra, who isn't able to move on, the two figures are himself, sitting next to the smaller Chronos, on a summer day. The little brother died on a heat-dazed day, this has resulted in Kestra's phobia for any kind of hot weather and places, which also means he cannot withstand heat.