I am someone who often takes care to invoke good luck. For example, I never skip a shrine visit before exams. Visiting a famous matchmaking shrine is a wonderful method for inviting love, but here is an even simpler matchmaking charm you can try at home.
First, clean the southeast corner of your room. Print out a photo of the person you like and place it there. On the back of the photo, write the kanji 縁 (en, meaning “bond”) in red ink, and circle it in red.
Hang the photo on a red string in the southeast corner. About one meter off the floor is ideal. When you sleep, always prepare two pillows, and wash the pillowcases every day.
I tried this charm myself, and I can confirm that a woman who had never noticed me before genuinely began to care for me. After that, what mattered next was diligent room cleaning — keeping clutter to a minimum, scrubbing the toilet and windows, and tending to small details. Pay attention to your hair, dress neatly even on ordinary days, and if possible, develop the habit of praying at a kamidana (household shrine) or visiting a shrine regularly. The effects become even stronger.
The point is this: when you consciously hold a loving, positive image of the person in your heart day after day, connections do tend to form. I recommend trying it.