There is no plot in this one since it's just an OVA. So the whole point is for the ecchi/erotic scene to be honest. The first part is the same generic ecchi slapstick, not worth mention because it's just the same daily interaction with the MC and the main heroines. The best part is gotta be the second half, the school teacher. That scene alone carries this whole series/franchise, the voice acting is also very good, 11/10 would watch it again ( ͡° ͜ʖ ͡°). That's all in it, I can't elaborate more but I had to write something to fill up the quota for this review lol.