Hikato Aiko

On January 29th, 2015, Haruka's social media accounts were hijacked by a person identifying themselves as "Aiko". Affectionately referring to him as "Senpai", Aiko claimed to be trying to help him keep up with his social media while he works on his current project. The nature of Haruka's replies implies that he does in fact know her personally. Shortly after taking control over his accounts, Aiko relinquished them at his request. Shortly after, several accounts under her name appeared and made contact with Haruka, again referring to him as Senpai.

Connection
Aiko appears to be close to Haruka, and is easily identified as a dedicated fan of his work. Affectionately referring to him as "Senpai" implies that she holds him in much higher regard to herself, despite seeming very narcissistic, calling herself "TheBestKouhai" (her twitter handle). Her Google+ account states that she works for Haruka as his Kouhai, but from their conversation while she retained control over his Facebook page, it can be reasonably inferred that Haruka does not actually request her help and that she merely offers it freely. Aiko's actual existence is rather confusing, however. Her sudden appearance without any previous mention reveals that she may in fact be a character created by Haruka himself as a counterbalance to himself. Her energetic and carefree attitude is certainly much different to his often solemn and distant portrayal. Aiko's recent disappearance from her social media further supports this theory.