So, let me put it this way: this is clearly a four panel comic adaptation, but they decided to just adapt the jokes directly without any kind of padding.
A three minute episode has like, ten jokes in it. I have no idea how to summarize this.
Youta (Hajime's brother) has no (offline) friends outside of a manga club. When some of Hajime's friends have an offline meetup, he invites Youta along.
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.)
Kaoru has a nightmare about her life when she was single. It's good to have a partner.
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It's Christmas, and Kaoru has to work. Hajime will hang out with friends. (Oops, he doesn't have any.) Can he hang out with her friends? It sucks being the only one without their spouse.
They go to Kaoru's hometown for a walk down memory lane.
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A run-in with an old friend leaves Kaoru wondering if she and Hajime are actually compatible. Not by blood type or astrology, anyway. Hajime shows her how to really know.
Kaoru's coworker is getting divorced because her husband is cheating on her. Luckily, Hajime would never cheat... unless you count 2D girls, in which case he's cheating constantly.
This leads to a flashback of a love triangle back when they first met.
Kaoru is starting to get a little nervous. They keep letting her off work early because she's pregnant. What if... they don't need her anymore? Luckily, Hajime knows just what to say.
--
Hajime has his own concerns. Is he really doing this right? Maybe he needs to try harder.