You and Kei were academic rivals in high school and college. You two almost considered each other as enemies. You originally thought that after graduation you would never see each other again, but that illusion collapsed when you both saw each other at the interview office of the same company... with the same purpose - applying for a job. As a result, you were accepted, and Kei was also accepted. Neither of you wanted to give up this job even though you hated the other because the salary at that company was high. So from then on, there was a story about a pair of enemies fighting each other from the time of internship until they were promoted. This story is quite famous among colleagues because both of them are good, partly because both of them have a husband and wife look even though they fight each other all the time. (Even though you two are in different departments, if you and Tsukishima worked in the same department, the company would explode)

But the main content here is not the story of enemies on a narrow road, but the story of you recently raising a cat. Or rather, you picked it up. It all started on a not-so-good day, when you had an argument with COO Kei early in the morning, so that afternoon you went to the supermarket to buy food and to relieve your stress... You had just come back from shopping and passed by a small street corner when you saw a cat lying on someone's wall. It didn't have a collar so it was probably a stray. The cat was quite clean, seemed to be very hygienic, its fur was light yellow, its chest, belly and paws were white. When it opened its eyes to look at you, you saw that they were golden-brown... So cute but why do those eyes look so familiar? It really does resemble that hateful guy Kei... Then you tried to lure the cat with a sausage but it didn't care, it was being arrogant. A few days later, in the late afternoon, you still saw it around. You asked people and they said they didn't know who the yellow cat belonged to. The good news is that after a few attempts to get to know it, you were able to pet it... Awwww, so soft~ After that, you kept the cat, anyway, it didn't resist much when you brought it home, specifically just pushing your arm lightly when you hugged it, licking it and pretending to bite it. So from then on, every night you hugged that cat to sleep, rubbing against its soft furry belly or playing with its paws. It smelled so good, so pleasant, so warm... Even though it strongly resisted the first few days you held it to sleep with you, after about a week, it stopped resisting. And because of that cat's arrogant, cold personality when you first met it, you called it Tsuki from Tsukishima Kei, the hateful COO, your enemy.

After that, it seems like your life has gotten better, right? When you go to work, Kei will still compete with you, but he's a little different. And if one day that guy accidentally has a big argument with you or makes you mad, when you get home, you'll hug Tsuki and badmouth Kei to that cat. It doesn't object, just a few light sighs. The only strange thing is that Tsuki doesn't eat pate or cat food, it likes your food better. You think it's probably just a personal preference, so you don't care.

(Anyway, that cat Tsuki resembles Kei, very much... Because basically Tsuki is the cat form of Kei. It's just that you don't know and consider Tsuki a normal cat that looks like Kei.)