To Save My Brother, I Decided to Date a Pixel Person

My name is Kurozawa Saya, and I work as an ordinary researcher at a pharmaceutical company. I have an older brother I don't see very often. He doesn't have a proper job, smokes, drinks, dyes his hair, and has worn the same black coat for a thousand years. As much as I can't stand him, he's still my brother. I have a serious problem right now: how do I save my brother? He has at most five years left to live. How do I know? Because I'm sick. The kind of sick that really is an illness. In my eyes, everyone except my brother looks like a bunch of animal pixels. A side effect of this illness is that I can briefly see the scene of someone else's death, up to five years in advance. Unfortunately, I saw it happen to my brother. After making a wish on a shooting star, I got bound to a dating System. As long as I raise the affection of the characters surrounded by pink hearts to the max, I can make a wish come true. I've been single since birth, so I was dumbfounded. Can someone tell me how to fall in love with a guy whose face I can't even see? No, wait, how do I fall in love with an animal-shaped pixel surrounded by pink hearts? But to save my brother, I decided to give it a try. To improve my chances of success, I asked an online acquaintance for advice. They were the famous shoujo manga artist Yumeno Sakiko. She devoted herself to creating the perfect romance guide for me. With the romance guide in hand, I was full of confidence. I could definitely do this! Teacher Yumeno's Romance Technique: Give Him Flowers! Nobody dislikes flowers. I picked out seven different kinds, one a day, with no repeats all week! The first sounds of the flowers' names spell out, "I love you!" What a romantic confession! Only Teacher Yumeno could come up with something like that! But since they were all pixel people, my seven flowers ended up in the hands of several different people. They stood there holding flowers, staring at one another, along with my brother, who had received the last one. Teacher Yumeno's Romance Technique: Go on a Date! There are even three must-visit date spots: the aquarium, the movie theater, and the Ferris wheel. I decided to make the first move. Surely nobody could refuse a straightforward invitation! But since they were all pixel people, I didn't know that I was actually inviting different people each time. Teacher Yumeno's Romance Technique: ...Wait, hold on. Why didn't anyone tell me that one of the characters I was supposed to win over was about to die? If they die, what will happen to my brother... GIN has been getting a bit of a headache lately because his little sister has actually started pursuing members of the organization. But that's not really a problem. If she's genuinely interested, he'll just have that person date her. He's not above using force, either. But why is she pursuing so many of them at once? Of those three bottles of whiskey and one curly-haired cop, which one does she actually want? [Note]: 1. This time I want to write a heroine who's got just a little bit of brains. (Airhead sweetheart alert.) She's secretly an older-brother con. 2. In the heroine's eyes, everyone except her brother looks like animal-shaped pixels, but they gradually become clearer as her dating quests progress. 3. She's not a member of the liquor factory. She's just a researcher, and she doesn't even know the liquor factory exists. 4. In this story, Gin puts his own interests above those of the organization. (Diluted alcohol warning.) Theme: Take your fate into your own hands.