I got that easily. You just have to sit and wait for him to sing his song on stage. Choose to stay and don't click anything when the song starts, and you'll get it. I got it cause I enjoyed listening to the song. xD
Viewing post in Sinsations - A BL / Yaoi Visual Novel comments
Yes, each true ending route seems to have some additional photos that I've seen. Mind you, I've only done Envy, Greed, and Gluttony's true endings. And Greed has 2 true endings. (everyone else only has 1)
And to get a route's true ending, you have to romance everyone but your main guy, then romance him last. Example: to get Pride's true ending, you have to date him last of the 6. A little annoying if you want to grab them all, but skip function is a godsend for that. =P
I suggest saving your top 3 guys for the last three, then save before you start them so you can swap whose last from there depending on what true ending you want to get.