The Chemical Reaction Between the Passerby Alpha and the Protagonist Gong

I am Monday, a person who lives up to his name as 1. Fifteen years after traveling to the ABO world, I discovered that I was traveling through books. Fortunately, I differentiated into Alpha, and I have a beautiful childhood sweetheart CP. Well, although he is also an A, what does it matter? ——Except that the beautiful CP is the protagonist of the novel. As for me? Oh, I was admitted to another school as mentioned at the beginning of the novel. I am a childhood sweetheart in name, but in fact I am just a passerby, not even a background NPC who lives in dialogues and phone calls. Oh. Although the copywriting is in the first person, the main text is not Attacker as passer A x Attacker as protagonist Mine Clearance: Gong is a really special passerby Intention: People have many choices, so I want to be the only choice