Melmo disguises herself as her mother to comfort Totoo, who misses his deceased mother intensely. Shogo, the school gang leader, falls in love with Melmo as her mother at first sight, and asks her to marry him. Asked for advice, Prof. Waregarasu explains to her what marriage is about. His advice makes Melmo prudent about marriage. She makes an unreasonable demand upon Shogo, hoping that he will give up. But to her surprise Shogo grows more enthusiastic.
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