Tanaka-kun's Valentine. Tanaka receives anonymous valentine chocolates, depressing him as it means he has to put effort into giving a gift in return on White Day. Ohta is mildly depressed when he receives cheaper quality bitter dark chocolate, but things turn sinister when Tanaka finds a threatening note. Ohta suspects it may be Miyano but discounts this when Miyano gives chocolate to Echizen but admits she forgot Tanaka and Ohta’s. After tasting Tanaka’s quality chocolate Ohta suspects it was homemade by Shiraishi, but overhears her admitting she had completely forgotten about Valentine’s day. Walking home they discover a sinister recording device in Tanaka’s bag before being confronted by Tanaka’s sister, Rino. She admits the device is something she uses for study purposes but put it in Tanaka’s bag by mistake. She invites Ohta to their home but treats him with mild hostility after hearing about their friendship and how he ate some of Tanaka’s chocolate, which she made. After he leaves she secretly reveals her feelings for Tanaka and swears she won’t let Ohta take him from her. Meanwhile, Tanaka naively believes Rino was actually being nice to Ohta for being his friend. Rino is furious that all she can hear on her device is Ohta as Tanaka’s voice is too soft for the device to record it properly.