Let’s talk about Jirou Yakuin — he’s definitely one of the standout characters in the anime More Than a Married Couple, But Not Lovers (or Fuufu Ijou, Koibito Miman for short). Jirou Yakuin is a 32-year-old office worker, and as it turns out, he shares the same workplace as Rika Shiraishi, who happens to be one of the central figures in the story. Right from the start, Jirou Yakuin comes across as someone you can count on — serious, dependable, and always doing his best at work. His colleagues may joke about how uptight he seems, but deep down, they really respect him. It’s kind of funny, actually — even though people tease Jirou Yakuin for being too by-the-book, they’re the first to turn to him when things get tough.

Now, while Jirou Yakuin has his professional life pretty much under control, his personal side tells a different story. He’s been single for a long time — like, chronically single — and hasn’t had any real romantic relationships. That’s where things get interesting, especially with Rika. They’re close friends, sure, but there’s this underlying tension, this unspoken possibility that maybe it could be more. Yet, neither of them seems able to take that leap. Watching Jirou Yakuin navigate that emotional space is both relatable and kind of heartbreaking at times.

One thing that really stands out about Jirou Yakuin is just how thoughtful he is. He’s the type of guy who’ll go out of his way to help someone, whether it’s a coworker struggling with a deadline or even a stranger on the train. He doesn’t do it for praise — he just genuinely cares. That quiet kindness makes Jirou Yakuin such a compelling character. You can’t help but root for him, especially as he tries to figure out how to balance taking care of others with taking care of himself.

As the series unfolds, we see how Jirou Yakuin’s work life and personal life start to blend together in unexpected ways. His evolving dynamic with Rika, along with the pressures of office politics and personal expectations, really pushes him to grow. It’s not just about romance — it’s about self-awareness, learning to open up, and realizing that being responsible doesn’t mean you have to carry everything alone. In many ways, Jirou Yakuin represents what so many young professionals go through: trying to succeed at work while also searching for connection and meaning outside of it.

When it comes to personality typing, there’s a strong case to be made that Jirou Yakuin fits the ISTJ profile — often referred to as “The Logistician.” Think about it: he’s practical, organized, and deeply committed to his responsibilities. Jirou Yakuin thrives on routine and structure, and he’s not really one for spontaneity. He’d rather stick to what works than take unnecessary risks. Plus, he’s pretty reserved — not because he’s unfriendly, but because he tends to keep his emotions private. That introverted, duty-driven nature? Classic ISTJ traits. And let’s not forget his decision to enter a marriage of convenience — something that makes perfect sense for someone who values stability and order above all else. So yeah, based on all this, it’s fair to say Jirou Yakuin lines up closely with the ISTJ type.

Then there’s the Enneagram angle. If we look at Jirou Yakuin through that lens, he seems to align strongly with Type 6 — “The Loyalist.” Why? Because loyalty and security are huge for him. He sticks to rules, follows procedures, and wants to make sure everything is safe and predictable. Even in his personal choices — like staying in a loveless marriage — you can see that desire for stability, even if it comes at a cost. Jirou Yakuin also shows signs of typical Type 6 behavior: he second-guesses himself, seeks reassurance from others, and often worries about worst-case scenarios. He’s not paranoid, exactly — he’s just cautious, always thinking ahead to avoid problems.

Of course, personality types aren’t set in stone. People are complex, and Jirou Yakuin is no exception. While the ISTJ and Type 6 labels fit well, they’re more like tools to understand him better, not definitive boxes. Still, when you put it all together — his reliability, his need for security, his quiet dedication — it’s clear that Jirou Yakuin embodies a lot of what these types represent.

In the end, Jirou Yakuin isn’t just a side character or a comic relief office guy. He’s someone dealing with real struggles — the pressure to perform, the loneliness of singledom, and the fear of change. Whether it’s at work or in his heart, Jirou Yakuin is trying his best. And honestly, that’s what makes him so easy to connect with. Jirou Yakuin might not be the loudest voice in the room, but his journey speaks volumes.