2.A Boss and a Babe-Both Leads were inappropriate in many instances for a work environment. They crossed boundaries and if any other character did what they did HR would be involved lol. It would be considered harassment in some cases. There are many examples in this show like one being A boss inviting himself to his intern's house or vacation lol
3.Romance of a Twin Flower-FL had a collection of portraits of the ML as proof she had been watching and was infatuated with him for a while. That would be stalking
4.Kabe Sa Doujin Sakka no Neko Yashiki-kun wa Shouninyokkyuu wo Kojiraseteiru-One of the leads had a shrine of the other filled with photos ad other stuff.It would seem like an obssesive fan or stalker behaviour if it were anyone else.