The people who are saying that Taichi shouldn't have been with Chihaya are the same people that were blind to all the effort Taichi has made to keep Chihaya happy.
Tai didn't even want to play karuta again but he joined the club to make chihaya's dream come true. He didn't want to give Arata's phone# to Chi but he still did because he cares more about how she feels than his own self. Have you not seen? That everytime Chihaya was having a rough time the person by her side was Taichi? Arata was never going to someone romantic to Chihaya, the longing that he felt for him was that of a comrade, a rival and someone to enjoy karuta with.
Chihaya (even though she didn't mean to) has disregarded Taichi's feelings, effort and just everything that he did for her and that's why on S3 episode 24 she called herself "I'm the rock" she was the rock that couldn't notice just how much Taichi cared.
I say that this is for the best. Chihaya needs someone like Taichi that will balance her life rather that Arata.
I mean what are we expecting? Only redeeming quality about this story is literally the art style. How is Jaekyung ever gonna make himself likeable at this point? He's only worse than Lord Seungho from POTN and that's saying something considering how this really just looks like a modern day POTN with how doctor Dan and jaekyung's dynamic is playing out. To be honest I expected something way better from this author.
Not necessarily need to be fantasy setting and what not. I just want it to be as wholesome, healthy and beautiful like what Shin and Wolfgang have. Their love has me on chokehold. They are IN LOVE with each other and my single ass wants what they have
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