On Sunday Day 7, increase your Charm at the Fight Club (drink beer in v2.3 or sleep with a prostitute in version v2.8). Then, go to the Mall and buy six necklaces (v2.3) or rings (v2.8) and one teddy bear.
In v2.8 only, on Wednesday Day 10 vote for Tomoko at the weird "Kof Cosplay" at City Hall. Speak to Tomoko twice (to boost your experience beyond 20), give her the six necklaces/rings, and she will be putty in your hands.
To get free relationship points without too much work, go to the pub, click "Easy", then click the second option.
There is not anything there, but if you click it you will fight the two enemies that are trying to take your girl.
Expect to see many updates daily, we wish you all happy holidays and a great new 2018!