Haru has blonde hair, pink eyes and long eyelashes, and is very cheerful and charismatic. He was a transfer student along with Yuki, and introduces himself as an alien, which people think is a joke due to his enthusiastic behaviour. He is seen carrying a fish in a fish bowl on his head, who refers to Haru as "brother". When upset with people's actions, he shoots them with a bright green water pistol, making it possible for him to briefly control their actions. He seems to be able to communicate telepathically.
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