I actually enjoyed it. There are a couple of ecchi moments, but it's nothing too over the top. Nagatoro really enjoys teasing senpai, but it's not from a place of malice. She absolutely takes delight in making him uncomfortable by saying rather suggestive things, and then throwing it back at him by saying "You're such a perv, senpai!", but once in a while she slips up and it backfires on her in a spectacular fashion.
IMHO it's worth a look. Hope you enjoy it if you decide to.