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➵ The only person that Wataru has ever given anyone a nickname is Yuu.➵ Yuu describes their meeting as a "fateful meeting" and considers himself lucky because he met Wataru.
➵ Yuu met Wataru at a pretty low point in his life (kicked out of Gyro, Reon + Kenta turned on him, returned to his home city where his family is) and it's pretty implied (← delusional person) that Wataru is the one who pulled him out of that slump and gave him another reason to live, to continue with his dream of making music.
➵ Prior to meeting the rest of Argonavis, Yuu states that "with my guitar and your bass, we can become the best band in Hakodate!"
➵ While often the one to bluntly voice negatives to Yuu's positives, Wataru truly does care about the success of the band and just wants Yuu to keep his head on.
➵ That being said, the two of them compliment each other perfectly. One is a pessimist ("It's not called being negative. It's called being a realist") and the other is an optimistic. They are complete opposites, and yet they gel perfectly together.
➵ In both the anime and the manga, Wataru is the one who manages to convince Yuu to rejoin the band after leaving due to low self esteem. He throws rocks at his apartment door and breaks into his apartment to bring him his acoustic guitar. Hard to say if he'd have responded to anyone else in that way.
➵ After calling Yuu the band dad, he proceeds to call Wataru the mum. Assigned married people by their friend. lol.
➵Wataru hates idiots but makes an exception for Yuu.
➵ Yuu called Wataru cute one time.
➵ This image.
➵ This one too.
➵ Also this one. I'd like to visit the part of Tokyo where this card was set - it'd be a pilgrimage.
➵ In the future section of Yuu's history in AAside, it is stated that Wataru is his right hand man.
➵ They have matching necklaces, both representing their roles within the band while also complimenting each other. Wataru has an anchor, symbolising how he is the grounding member of the band, and Yuu has a compass, symbolising his status as the leader, the guiding light. A ship can't sail without the anchor or a navigation method such as a compass.
➵ Their first meeting was depicted almost as if someone had just met an angel.
➵ Immediate friends :) "Hit it off" is the exact wording used in AAside.
➵ They're the red/blue trope but instead they're orange/purple (still a cool/warm duo...! It counts to me!) I don't know what to tell you.
➵ "That's my Wataru!"
➵ This Puchigonavis panel.
➵ In Wataru's third AAside character story, he appears to have been waiting anxiously for Yuu to return home so that they could listen to a CD together. Yuu is taken aback by how excited he is, clearly having not seen him in this way before. Perhaps there is something about wanting to share that excitement with someone special to him, rather than simply asking to borrow the CD and enjoy in his own time?
➵ In Wataru's fourth AAside character story, he plays the guitar for a short moment and says he is nowhere near as good as Yuu.
➵ In Yuu's third AAside character story, they both share a moment playing along to a song by a band they both admire.
➵ In chapter 1 of the AAside Argonavis - The Beginning story, Wataru has an introspective moment and suddenly thanks Yuu. It is revealed that he thanks him for being the one who invited him into the band in the first place and continues to pull him along despite everything.
Image from here. Lace border from here.