Junichirou Hoshi

"Junichirou is a young man around Najimi's age who she first met in a adult game store while she was buying one such game to help her with drawing her doujinshi. He later became her first customer the first time she was selling her doujinshi, though he was the only customer at the time. Later when Najimi gets a job at a cosplay restaurant, he comes every day, which makes Justice believe he is a stalker due to him showing up around Najimi so often. He does in fact have a crush on her, and has to persevere against Justice's antics to get close to her."

(Source: Wikipedia)