Kaoru collapses from overwork she's pregnant. Also, she needs to quit smoking. Hajime goes a little too far in caring for her until she yells at him to stop being fake.
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Kaoru is embarrassed at her incompetence at cooking. She gets help and advice from her father. (a pro.)
I think it's hard to have serious buildup on anything over 7 minutes of runtime.
They spend a day looking after a relative's kid. It's cute.
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A flashback to their first date. It's cute.
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Previous claims of pregnancy are a misreading. But they're thinking seriously about it.
Hajime: How about Shinji if it's a boy and Rei if it's a girl?