First Impression about this series : I started this series blind i didn't know very much what to think i did know that it was an ecchi harem series and one of the motive that i started this series was because of a certain character named Naru Narusegawa 
She is the tsundere character and
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the main love interest of the protagonist, Keitarou Urashima.Anyways let's start with a good explanation about the title. So we have our main character, Keitarou Urashima, who btw doesn't have a succesful life so far he is a ronin for the second time, failed to apply to Todai 2 times in a row
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actually 3 times but spoilers . He doesn't have a girlfriend or any interaction with opposite gender and he just got kicked from his house luckily his grandma calls him to go to Hina inn to become the manager there and that's how the story begins. I want to say that this summary was kinda pointless but trust me is not because this plot got me into early on especially the fact that we got a look about the relation ship of Keitaro and Naru.
I want to speak about their relationship so hard but i need to contain myself a little more. In the story we mostly see a lot of gag comedy that doesn't have sense in the real world especially the turtle thing. The good part of the story i mostly want to say is the Keitaro daily life at Hina inn , how he interacts with every girl in that inn (dorm) and with other characters how every characters has very own jokes that fun in very own way and how his relationship grows with the characters. Ok now i can say my favourite part of the story and that's the relationship between Naru and Keitaro.
Their Relationship starts a bit rocky especially because it starts with a missunderstanding step that being that Naru founds him in the spa that where only for girls and she really thinked that he was a pervert.
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(that gag moment never gets old in this manga tho cuz in the last 2 chapters we get a trowback to remind us how the story began ) Anyways I like the aspects that the Naru is the only character that harass the character but at the same time she helps him the most especially with the learning process and go to Todai, she is a bit annoying but at the end of the day she is the character that is very innocent even though she seems tough on the outside (that's basically an Tsundere archetype i love the archetype in the most ocasion that's why i really enjoyed her moments with Keitaro when she was blushing). The manga shows us a lot of moments when Naru and Keitaro are perfect for each other (and really a lot)
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My favourite part of their relation ship was like in 1999 when they needed to study for the exam center at Today and mock examens again. That really defied their romantic feeling at least for Keitaro cuz Naru was still conflicted
The most difficult with a tsundere character aspect is that they're lying to themselves for the most part about they're feelings.
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Naru ghosted Keitaro after he confessed to her but is a good part that she got the courage to tell him about her feelings
I don't think that i need to say the major spoiler of who is the promised girl and that arc cuz to be fair i kinda found more like an excuse final arc to the manga that
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defined they're relationship status (I'm glad that the epilogue was great tho)
You know is funny how the relationship of Keitarou and Naru is a
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parallel to other relationship Seta and Haruka. Another fun fact is funny how Haruka and Naru have some qualitys in common how they get extremly fast embarassed when Keitaro and Seta are being romantic with them, and is funny how Keitaro in the future becames likes Seta (man i really love this aspects of the story)
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I think now is a good moments about how I feel about the whole aspects of the story and yeah I am speaking of the problems of early adulthood life. Luckily I didn't experiment being a
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3 times in a row ronin Rn i am a student working for a master degree but i kinda feel about the same with the mc in the first part of the story (i feel that my life is somehow constant) that's probably because i don't have a job rn (and yeah is really hard to find a job in this economy) and i don't have a girlfriend so that's maybe another aspect why i got attached to this series early on. The Fact that Keitaro was a loser but he didn't lost into a despair and he actually keep going on was an aspect that i loved
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especially with the part of Naru ghosting him and the part with healding a year back at Uni because of a certain accident. I'm so glad that he actually married Naru This series kinda hits hards when you start to read because of the aspects of how times moves and how the good old days will be gone before you realize but you must continue and pursue what you want if you want to live in your happy own world. I really wanted to grand to this series a bigger grade but thx to some gags that i didn't enjoyed and the final parts of the story i kinda put it lower than I expected when i was at half of the story tho I still loved the ending. My final grade is 8.5/10 (I 100% recommend this manga).
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