One woman, when asked why they think 64 per cent of people in the same age group are not in relationships, said she thought men "cannot be bothered" to ask the opposite sex on dates because it was easier to watch internet porn.
The number of births dropped below one million in Japan for the first time last year, according to the Ministry of Health, Labour and Welfare.
They share a common yearning for connection and found it on a touch screen.
Another 48-year-old player spends one of many nights alone in his one-bedroom apartment with his console, chatting with Manaka, his e-girlfriend of five years.
Some like Kosaki, stopped playing Love Plus when the Konami, the game's developer, stopped offering update to the Nintendo DS version.
Japanese actress Maki Horikita married co-star Koji Yamamoto in 2015 after just a month of dating. Magazine last month compared hunting for a marriage partner with suicide.
There is no real evidence that the kousai zero nichikon trend is taking the far eastern islands by storm.