It has been six months since her only son, Keita, moved to Tokyo to attend university. His mother, Hana, came to check on him, worried about him because he was constantly whining. She sees the mess in his rundown room and Keita on the verge of bursting into tears. (He can't live without me.) Hana is Kokoro to be relied on by her son. Meanwhile, Keita has reaffirmed his love for Hana as they spend their first parent-child interaction in a long time. Their feelings and desires overflow during their brief rendezvous, and they cross the unforgivable line between parent and child.