It gets worse in his bad end, where it is implied he eventually rapes the heroine, and then chains her in the cage and treats her like his personal doll as she slowly loses her sense of self. Which he then fills with stuffed animals and childlike toys, because he thinks she still likes the same things she did as a kid.

The situation becomes more disturbing after the heroine 'disobeys' his order not to leave the house in order to try to figure out what's going on and recover her memories, and instead of filling her in on the situation like a normal person, he drugs her to keep her asleep most of the day and eventually locks her in a dog cage. Unfortunately, his desire to protect the heroine from danger soon proves problematic, as he utilizes her memory condition in order to pretend to be her boyfriend, steal her phone and computer battery, and whisk her away to his house all so he can shield her from the cruel pranks being played on her by her male friend's group of angry fangirls (rotten eggs in the mailbox, emails telling her to commit suicide, etc.) When the heroine of Amnesia collapses in front of him at the start of the game, he rushes her to the hospital and sets his own life aside to look after her once she's released.

At first, Toma comes across as a kind, protective older-brother type, the childhood friend of our amnesiac heroine.