I don't know why Chinese and Korean version of a Japanese doujin ends up being the only version of it on this site. I'm glad there are some people who are generous enough to get the raws out to the public.
Hajime is tasked with tutoring two female classmates. His tutors are Natsumi Kuroda and Sayaka Kawashima, who are at the top of the school social hierarchy (popular girls). For Hajime, who doesn't even have friends, these girls are out of his league and he cannot even talk to them. These two girls suddenly show up to his room. Studying with these girls is a fascinating experience for Hajime who is unfamiliar with this situation. While he's nervous about Natsumi's closeness, he secretly enjoys her faint scent and sneaks a peek at Sayaka's voluptuous chest but the session itself proceeds very seriously. As a result, Natsumi and Sayaka's grades improve dramatically. The three of them grow closer through the study session, so they have a party but while they're fooling around, they discover Hajime has an erection. Feeling deeply indebted to Hajime, the girls suggest a different study session as a way of thanking him... Hajime, who is at the mercy of the two girls, devotes himself to the other study (͠≖ ͜ʖ͠≖)