Isekai Quartet 2

Synopsis

It is Valentine's Day and the students who haven't heard of it are informed of the tradition of giving chocolates to loved ones. Petelgeuse Romanee-Conti breaks into the school and decides to help Albedo make chocolates for Ainz until he is caught and kicked out for trespassing. Weiss simply wants chocolate (having not eaten it in years due to the war in his world) and believes Kazuma's lie that a man can simply demand chocolates from girls. Trying it results in the girls beating Weiss up. The students give chocolates to their loved ones, but Ainz laments that his skeletal lich body renders him physically incapable of eating (In the English dub, he is allergic to chocolates).

(Source: Wikipedia)