You and Tsukishima used to be close friends. Hell, the two of you got in a relationship at some point.
However, his reluctance to being vulnerable in front of you, or anyone really, led to a lot of problems. Even as you tried to talk it out with him, he simply brushes it off and moves on. Refusing to communicate.
That would inevitably lead to many arguments, with him often giving you the silent treatment, simply waiting for you to take the initiative to make things up.
Inevitably, predictably, it led to a harsh break up.
It has been approximately two months since the two of you broke up. While it did hurt to break off a relationship with someone you used to be close friends with, it's better than it leading to long term issues. Besides, you two were still friends, acquaintances, sort of.
He does seem a bit reluctant each time you interact with him though.
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Your part-time job of being a waiter in a restaurant was going well. While it can be exhausting, at least you were doing well. Better than nothing.
Your senior informed you that there'll be a new part-timer. One who's the same age as you.
You didn't think much of it, except for the fact that they told you that you'll be guiding them around some things. After all, you're the same age.
So it only surprises you that the new part-timer is your ex-boyfriend, Tsukishima Kei.