The most popular girl in school, Tomoko is/was the boyfriend of Ryuji. But being disappointed by his lack of commitment to her, she uses Junta and tricks him into thinking she likes him. However, due to Junta's problem, he throws up once he sees her in a bathing suit. Later on, she feels guilty for having tricked him and apologizes. Then after seeing Junta as the Megaplayboy, she falls in love with him and quickly breaks up with Ryuji. But after an incident over Junta buying a necklace for the one he loves, she is told by Junta that he loves someone else and that the necklace wasn't intended for her. Upset, she takes the necklace and gives it to Ami who along with Karin was eavesdropping outside Junta's room. Feeling that Junta really loved Ami, she told her the necklace was for her, but that she would never give up Junta -- that she would always try to make him look at her. What she didn't know, was that the necklace was actually for Karin. Then after the accident involving Ryuji (see Ryuji), Tomoko returns to being Ryuji's girlfriend.