i heard this was an extra. what the main manga's title?

Koi to Sentimentalism (Love and Sentimentalism)
https://ffmanhua-com-p.surfly.com/www/HT/mAQJNwu5USyexCeYK44nyGQ//////////manhua/4284/8485.html?SURFLY_TAB_PREFIX=_surfly_tab0

D': its not working for me

AH SHIZ, SORRY

This is pretty late but if you're still looking for the raws, it's in yaoiotaku