@Sceleris -
Tomoko is bi. She can enthusiastically play for both teams.
Yuri, I am almost certain, will end up being Tomoko's sister-in-law or something similar. Several striking times, since she bewildered herself by catching his sleeve when he came to pick something up in the classroom, she has passed Tomoki and a big flag went up on her face or she briefly looked looked back before, sometimes, nervously telling who she's with who the dark stranger is, taunting Hina with knowing his identity in the cafeteria, and most recently accidentally disclosing her knowledge of him to his vigilant sister. Tomoki doesn't have a clue, and neither does she. They're made for each other.
The sentence at the beginning of 151: "I like her but she's a mystery to me." Tomoko is fascinated with Yuri in a nervous sort of way and has been since they really began to be friends. Her attempts to be friendly resulted in inexplicable (from Tomoko's point of view) friction due to her not understanding that not addressing Yuri by name would hurt Yuri. She doesn't understand Yuri's occasional frustrated violence, and Yuri's mercurial emotional shifts puzzle her.
Uchi? I hope that she will come to grips with her sexuality and fall in love with a great woman in college.
Hina? She's wonderful, but she is going to turn out to be a sexual opportunist.
Asuka - DING DING DING. If anyone is lesbian in Watamote, it is Asuka. Some insanely lucky woman awaits her. I just can't understand denying Tomoko's galvanized, hyper responsive attraction to her. Tomoko would say "yes" before she knew her mouth was moving. And Asuka seems truly taken with Tomoko.