Mina, who is in a slump and has no place at home, devotes herself to her work to ease her loneliness. Her kind and sincere attitude towards everyone and her rare beauty make her colleague Asano fall in love at first sight. When Mina occasionally shows a lonely expression, Asano actively talks to her to cheer her up. His honest and sincere feelings melt Mina's cold Kokoro... and she steps over a line that should never be crossed.