Arata Natsume works at a child guidance center, is in his thirties and single with no plans for marriage. But one day, he receives a request from the child he was in charge of, Takuto, to "meet the criminal who killed his father". That serial killer is Shinagawa Shinju, also known as the "Shinagawa Pierrot". (Source: Shogakukan, translated)
Hareyakana-shi is a city in Japan known to locals where travelers come seeking redemption and the meaning to life. Wholly unrelated, "Monday's Forecast for Hareyakana-shi" is a wholly depressing and casually erotic tale of 4 estranged youths and their day-to-day adventures in finding meaning in life, or whatever comes close. Also, one of them is an absolute alien.