Utsurou Kanojo-tachiUtsurou Kanojo-tachi (Pre-Serialization); うつろうカノジョたち; Những cô bạn gái mong manh/dễ đổi thay; Alternating Girlfriends

Tokimasa is an eccentric yet brilliant high school boy who claims to be aroused by numbers and letters. And yet, a girl actually confessed her feelings to him!?