咲良（杉野希妃 饰）是一名中学老师，某日，她意外得到了许久没有联系的父亲的消息，并在父亲家中遇见了名为望人（太贺 饰）的少年。让咲良感到震惊的是，望人竟然正在遭受父亲的监禁，并且和父亲有着肉体关系。 害怕自己的罪行被揭露，咲良的父亲将望人塞给了女儿，就这样，咲良和望人开始了他们的“同居”生活。随着时间的推移，咲良发现自己渐渐对望人产生了感情，两人最终发生了关系，然而，渐渐地，望人不再是曾经那个纯洁懵懂的少年，对望人日渐失望的咲良产生了分手的念头。最后，咲良惨遭前男友的强暴，因此而对男人产生了恐惧，当他决定将望人还给父亲是，望人做出了一个惊人的举动。

In suburban Tokyo, the Kobayashis – Mikio, his young second wife Natsuki, and his young adolescent daughter Eriko, who was borne out of his first marriage – live in a small flat above the family printing business. Mikio inherited the business and the flat from his father who passed away two years ago. Temporarily living with them is Mikio’s divorced sister Seiko, who is there until she decides what to do, which is in her mind – unrealistically – to go abroad to learn English. Their rather dull and staid lives are punctuated by Eriko’s pet parakeet having recently flown away, it which they are scouring the neighborhood looking for, and their neighbors organizing a neighborhood watch to keep out undesirables, namely foreigners who they believe are causing no good to their society. Into their lives stumbles Hanataro Kagawa, the son of their father’s old friend. Before they know it, Kagawa has talked his way into a job working at the print shop and room and board in their flat.

Theatre 1 (Observational Film Series #3) is a feature length documentary, which closely depicts the world of Oriza Hirata, Japan's leading playwright and director, and his theatrical company, Seinendan. By depicting them, the film leads the audience to revisit fundamental but timely questions: What is theatre? Why do human beings act?