ONLY END ("Too priceless to grade")
Follow everything in Taiga's normal end guide
On 1/3 Ami will tackle you on the street and talk to you
Pick J-Just a dizzy spell...?
After that go talk to Yuri on the Riverbed
Another alternative is continuing on until the moment Taiga runs off the planetarium
At that time Talk to Yuri on the Riverbed
Read through to get Yuri's ending that's so good she's unable to grade it (or so she says)