Read manga: Taiyou ni Nurete

manga
Summary:

1-2) Soaked by the Sun
A beautiful transfer student, Takayama is weak and often absent from the PE lesson, because he has an allergy to sunshine. He is bullied by other students, but a very handsome & cool student, Kasai tries to help him. 

3) Mosaic Boy
Hero has changed into a girl when his pulse increases since a bisexual butterfly genes were injected into him by his father, a mad scientist. He is loved by a handsome classmate.

4) Scramble Papa
The heroine's boyfriend is forced to train for the role of Yamato Nadeshiko - true japanese virtuous woman - and goes to see her father to bargain directly 

5) Goodbye Hello
A jinx is moved by another boy who prays for his lover's luck with a simple heart.