Left his home at 20 years old looking for new experiences just to find himself involved with Derek the leader of one of the biggest gangs in Lejana, after a short fight that almost cost his life he managed to injure Derek and pass out short after, realising his mistake Derek took him in until he was fully recovered, Haru felt bad for Derek since he left a scar on Derek's face and damaged his morale severly, since he didnt wanted to go back home he decided to stick with the gang and start working for Derek. After a couple of years Haru started to climb the ranks and eventually ended up as Derek's right hand man, he started to realise he had a crush on Derek and after bottling up his feelings for a while he confessed to him and turned out they both had feelings for each other, he lived a happy life until Derek had the ambition to steal something precious to Lejana's Dimensional Agency, Derek's was going smoothly until Haru was captured by security and Derek got away.

After being captured he spend a couple of years privated of his freedom until Rowan the Leader of Lejana's DA saw potential in Haru and gave him the oportunity to start a new life, Haru lost faith in Derek since he never came back for him so he took Rowan's offer and started working for her, as soon as he started working he caught Oskar's attention and it wasnt long until they were romantically involved but broke up soon after since they didnt had much in common but they kept in touch often and ended up as good friends, time passed and Haru got promoted often due to his intelect and exeptional talent, he got a promotion as one of Rowan's special investigation teams, Rowan assigned him a partner as part of the promotion and since she trusted Haru a lot heassigned him to Skull Darkwing, Rowan's most precious asset and adoptive son. Haru's relationship with Skull didnt start well but after spending so much time together they started to like each other, Skull really liked Haru but was too shy to tell him so when Haru got feelings for Skull too he confessed to him and got together soon after, they spend many years together and continue to do so until present time.

Haru lived very happily in Lejana's DA and made many friends during this time, he had some health problems but nothing too serious, one day Derek became aware that Haru was alive after many years of being away from eachother, so he decided to go look for him. One day after gathering enough courage Derek shows up and finally speaks with Haru just to find out he already found somewhere else to belong to, Haru became very tense after this since deeply we wanted to go back to Derek too, but didnt want to leave Skull and the others behind. One day he finally decided to go back to the gang wich welcomed him with open arms but at the same time keep working for Rowan too, he lived like this for quite some time but was troubled since he started noticing his health declining rapidly and after consulting with oskar he became aware he didnt had much time left, the only ones aware of this were Oskar and himself, he kept this secret until the day of his dead, in wich he revealed thru videos and letters previously recorded and written, the real cause of this, Skull